diff --git a/.chronus/changes/removeUnusedPython2Code-2025-0-14-13-46-4.md b/.chronus/changes/removeUnusedPython2Code-2025-0-14-13-46-4.md
new file mode 100644
index 00000000000..e3b53f73862
--- /dev/null
+++ b/.chronus/changes/removeUnusedPython2Code-2025-0-14-13-46-4.md
@@ -0,0 +1,8 @@
+---
+changeKind: internal
+packages:
+  - "@autorest/python"
+  - "@azure-tools/typespec-python"
+---
+
+Remove unused python2 code from vendored serialization
\ No newline at end of file
diff --git a/packages/autorest.python/package.json b/packages/autorest.python/package.json
index 6e8064d3496..e4cdbdce311 100644
--- a/packages/autorest.python/package.json
+++ b/packages/autorest.python/package.json
@@ -29,7 +29,7 @@
   },
   "homepage": "https://github.com/Azure/autorest.python/blob/main/README.md",
   "dependencies": {
-    "@typespec/http-client-python": "~0.6.2",
+    "@typespec/http-client-python": "https://artprodcus3.artifacts.visualstudio.com/A0fb41ef4-5012-48a9-bf39-4ee3de03ee35/29ec6040-b234-4e31-b139-33dc4287b756/_apis/artifact/cGlwZWxpbmVhcnRpZmFjdDovL2F6dXJlLXNkay9wcm9qZWN0SWQvMjllYzYwNDAtYjIzNC00ZTMxLWIxMzktMzNkYzQyODdiNzU2L2J1aWxkSWQvNDQ3NjI5MC9hcnRpZmFjdE5hbWUvYnVpbGRfYXJ0aWZhY3RzX3B5dGhvbg2/content?format=file&subPath=%2Fpackages%2Ftypespec-http-client-python-0.6.3.tgz",
     "@autorest/system-requirements": "~1.0.2",
     "fs-extra": "~11.2.0",
     "tsx": "~4.19.1"
diff --git a/packages/autorest.python/samples/specification/azure_key_credential/generated/azure/key/credential/sample/_serialization.py b/packages/autorest.python/samples/specification/azure_key_credential/generated/azure/key/credential/sample/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/samples/specification/azure_key_credential/generated/azure/key/credential/sample/_serialization.py
+++ b/packages/autorest.python/samples/specification/azure_key_credential/generated/azure/key/credential/sample/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/samples/specification/basic/generated/azure/basic/sample/_serialization.py b/packages/autorest.python/samples/specification/basic/generated/azure/basic/sample/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/samples/specification/basic/generated/azure/basic/sample/_serialization.py
+++ b/packages/autorest.python/samples/specification/basic/generated/azure/basic/sample/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/samples/specification/directives/generated/azure/directives/sample/_serialization.py b/packages/autorest.python/samples/specification/directives/generated/azure/directives/sample/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/samples/specification/directives/generated/azure/directives/sample/_serialization.py
+++ b/packages/autorest.python/samples/specification/directives/generated/azure/directives/sample/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/samples/specification/management/generated/azure/mgmt/sample/_serialization.py b/packages/autorest.python/samples/specification/management/generated/azure/mgmt/sample/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/samples/specification/management/generated/azure/mgmt/sample/_serialization.py
+++ b/packages/autorest.python/samples/specification/management/generated/azure/mgmt/sample/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/samples/specification/multiapi/generated/azure/multiapi/sample/_serialization.py b/packages/autorest.python/samples/specification/multiapi/generated/azure/multiapi/sample/_serialization.py
index a94487cbf17..13217d075d8 100644
--- a/packages/autorest.python/samples/specification/multiapi/generated/azure/multiapi/sample/_serialization.py
+++ b/packages/autorest.python/samples/specification/multiapi/generated/azure/multiapi/sample/_serialization.py
@@ -184,73 +184,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2050,7 +1984,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/AzureBodyDuration/bodyduration/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/AzureBodyDuration/bodyduration/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/AzureBodyDuration/bodyduration/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/AzureBodyDuration/bodyduration/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/AzureReport/azurereport/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/AzureReport/azurereport/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/AzureReport/azurereport/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/AzureReport/azurereport/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/CustomPollerPager/custompollerpager/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/CustomPollerPager/custompollerpager/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/CustomPollerPager/custompollerpager/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/CustomPollerPager/custompollerpager/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/CustomUrlPaging/custombaseurlpaging/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/CustomUrlPaging/custombaseurlpaging/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/CustomUrlPaging/custombaseurlpaging/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/CustomUrlPaging/custombaseurlpaging/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/Head/head/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/Head/head/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/Head/head/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/Head/head/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/HeadExceptions/headexceptions/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/HeadExceptions/headexceptions/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/HeadExceptions/headexceptions/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/HeadExceptions/headexceptions/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/HeadWithAzureKeyCredentialPolicy/headwithazurekeycredentialpolicy/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/HeadWithAzureKeyCredentialPolicy/headwithazurekeycredentialpolicy/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/HeadWithAzureKeyCredentialPolicy/headwithazurekeycredentialpolicy/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/HeadWithAzureKeyCredentialPolicy/headwithazurekeycredentialpolicy/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/Lro/lro/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/Lro/lro/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/Lro/lro/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/Lro/lro/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/LroWithParameterizedEndpoints/lrowithparameterizedendpoints/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/LroWithParameterizedEndpoints/lrowithparameterizedendpoints/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/LroWithParameterizedEndpoints/lrowithparameterizedendpoints/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/LroWithParameterizedEndpoints/lrowithparameterizedendpoints/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/MixedApiVersion/mixedapiversion/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/MixedApiVersion/mixedapiversion/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/MixedApiVersion/mixedapiversion/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/MixedApiVersion/mixedapiversion/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeBatch/azure/packagemode/batch/head/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeBatch/azure/packagemode/batch/head/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeBatch/azure/packagemode/batch/head/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeBatch/azure/packagemode/batch/head/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeBatch/azure/packagemode/batch/paging/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeBatch/azure/packagemode/batch/paging/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeBatch/azure/packagemode/batch/paging/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeBatch/azure/packagemode/batch/paging/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeCustomize/azure/packagemode/customize/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeCustomize/azure/packagemode/customize/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeCustomize/azure/packagemode/customize/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeCustomize/azure/packagemode/customize/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeDataPlane/azure/packagemode/dataplane/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeDataPlane/azure/packagemode/dataplane/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeDataPlane/azure/packagemode/dataplane/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeDataPlane/azure/packagemode/dataplane/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeMgmtPlane/azure/package/mode/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeMgmtPlane/azure/package/mode/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeMgmtPlane/azure/package/mode/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/PackageModeMgmtPlane/azure/package/mode/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/Paging/paging/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/Paging/paging/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/Paging/paging/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/Paging/paging/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/SecurityAadSwagger/securityaadswagger/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/SecurityAadSwagger/securityaadswagger/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/SecurityAadSwagger/securityaadswagger/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/SecurityAadSwagger/securityaadswagger/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/SecurityKeySwagger/securitykeyswagger/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/SecurityKeySwagger/securitykeyswagger/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/SecurityKeySwagger/securitykeyswagger/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/SecurityKeySwagger/securitykeyswagger/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/StorageManagementClient/storage/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/StorageManagementClient/storage/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/StorageManagementClient/storage/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/StorageManagementClient/storage/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/SubscriptionIdApiVersion/subscriptionidapiversion/_serialization.py b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/SubscriptionIdApiVersion/subscriptionidapiversion/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/SubscriptionIdApiVersion/subscriptionidapiversion/_serialization.py
+++ b/packages/autorest.python/test/azure/legacy/Expected/AcceptanceTests/SubscriptionIdApiVersion/subscriptionidapiversion/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureBodyDurationVersionTolerant/bodydurationversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureBodyDurationVersionTolerant/bodydurationversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureBodyDurationVersionTolerant/bodydurationversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureBodyDurationVersionTolerant/bodydurationversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureParameterGroupingVersionTolerant/azureparametergroupingversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureParameterGroupingVersionTolerant/azureparametergroupingversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureParameterGroupingVersionTolerant/azureparametergroupingversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureParameterGroupingVersionTolerant/azureparametergroupingversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureReportVersionTolerant/azurereportversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureReportVersionTolerant/azurereportversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureReportVersionTolerant/azurereportversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureReportVersionTolerant/azurereportversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureSpecialsVersionTolerant/azurespecialpropertiesversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureSpecialsVersionTolerant/azurespecialpropertiesversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureSpecialsVersionTolerant/azurespecialpropertiesversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/AzureSpecialsVersionTolerant/azurespecialpropertiesversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/CustomBaseUriVersionTolerant/custombaseurlversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/CustomBaseUriVersionTolerant/custombaseurlversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/CustomBaseUriVersionTolerant/custombaseurlversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/CustomBaseUriVersionTolerant/custombaseurlversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/CustomPollerPagerVersionTolerant/custompollerpagerversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/CustomPollerPagerVersionTolerant/custompollerpagerversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/CustomPollerPagerVersionTolerant/custompollerpagerversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/CustomPollerPagerVersionTolerant/custompollerpagerversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/CustomUrlPagingVersionTolerant/custombaseurlpagingversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/CustomUrlPagingVersionTolerant/custombaseurlpagingversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/CustomUrlPagingVersionTolerant/custombaseurlpagingversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/CustomUrlPagingVersionTolerant/custombaseurlpagingversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/HeadExceptionsVersionTolerant/headexceptionsversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/HeadExceptionsVersionTolerant/headexceptionsversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/HeadExceptionsVersionTolerant/headexceptionsversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/HeadExceptionsVersionTolerant/headexceptionsversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/HeadVersionTolerant/headversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/HeadVersionTolerant/headversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/HeadVersionTolerant/headversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/HeadVersionTolerant/headversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/LroPagingVersionTolerant/lropagingversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/LroPagingVersionTolerant/lropagingversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/LroPagingVersionTolerant/lropagingversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/LroPagingVersionTolerant/lropagingversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/LroVersionTolerant/lroversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/LroVersionTolerant/lroversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/LroVersionTolerant/lroversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/LroVersionTolerant/lroversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/LroWithParameterizedEndpointsVersionTolerant/lrowithparameterizedendpointsversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/LroWithParameterizedEndpointsVersionTolerant/lrowithparameterizedendpointsversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/LroWithParameterizedEndpointsVersionTolerant/lrowithparameterizedendpointsversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/LroWithParameterizedEndpointsVersionTolerant/lrowithparameterizedendpointsversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/PagingVersionTolerant/pagingversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/PagingVersionTolerant/pagingversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/PagingVersionTolerant/pagingversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/PagingVersionTolerant/pagingversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/StorageManagementClientVersionTolerant/storageversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/StorageManagementClientVersionTolerant/storageversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/StorageManagementClientVersionTolerant/storageversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/StorageManagementClientVersionTolerant/storageversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/SubscriptionIdApiVersionVersionTolerant/subscriptionidapiversionversiontolerant/_serialization.py b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/SubscriptionIdApiVersionVersionTolerant/subscriptionidapiversionversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/SubscriptionIdApiVersionVersionTolerant/subscriptionidapiversionversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/azure/version-tolerant/Expected/AcceptanceTests/SubscriptionIdApiVersionVersionTolerant/subscriptionidapiversionversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGCustomizationCustomizedVersionTolerant/dpgcustomizationcustomizedversiontolerant/_serialization.py b/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGCustomizationCustomizedVersionTolerant/dpgcustomizationcustomizedversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGCustomizationCustomizedVersionTolerant/dpgcustomizationcustomizedversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGCustomizationCustomizedVersionTolerant/dpgcustomizationcustomizedversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGCustomizationInitialVersionTolerant/dpgcustomizationinitialversiontolerant/_serialization.py b/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGCustomizationInitialVersionTolerant/dpgcustomizationinitialversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGCustomizationInitialVersionTolerant/dpgcustomizationinitialversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGCustomizationInitialVersionTolerant/dpgcustomizationinitialversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGServiceDrivenInitialVersionTolerant/dpgservicedriveninitialversiontolerant/_serialization.py b/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGServiceDrivenInitialVersionTolerant/dpgservicedriveninitialversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGServiceDrivenInitialVersionTolerant/dpgservicedriveninitialversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGServiceDrivenInitialVersionTolerant/dpgservicedriveninitialversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGServiceDrivenUpdateOneVersionTolerant/dpgservicedrivenupdateoneversiontolerant/_serialization.py b/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGServiceDrivenUpdateOneVersionTolerant/dpgservicedrivenupdateoneversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGServiceDrivenUpdateOneVersionTolerant/dpgservicedrivenupdateoneversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGServiceDrivenUpdateOneVersionTolerant/dpgservicedrivenupdateoneversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGTestModelsVersionTolerant/dpgtestmodelsversiontolerant/_serialization.py b/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGTestModelsVersionTolerant/dpgtestmodelsversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGTestModelsVersionTolerant/dpgtestmodelsversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/dpg/version-tolerant/Expected/AcceptanceTests/DPGTestModelsVersionTolerant/dpgtestmodelsversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/Multiapi/multiapi/_serialization.py b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/Multiapi/multiapi/_serialization.py
index a94487cbf17..13217d075d8 100644
--- a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/Multiapi/multiapi/_serialization.py
+++ b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/Multiapi/multiapi/_serialization.py
@@ -184,73 +184,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2050,7 +1984,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiCredentialDefaultPolicy/multiapicredentialdefaultpolicy/_serialization.py b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiCredentialDefaultPolicy/multiapicredentialdefaultpolicy/_serialization.py
index a94487cbf17..13217d075d8 100644
--- a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiCredentialDefaultPolicy/multiapicredentialdefaultpolicy/_serialization.py
+++ b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiCredentialDefaultPolicy/multiapicredentialdefaultpolicy/_serialization.py
@@ -184,73 +184,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2050,7 +1984,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiCustomBaseUrl/multiapicustombaseurl/_serialization.py b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiCustomBaseUrl/multiapicustombaseurl/_serialization.py
index a94487cbf17..13217d075d8 100644
--- a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiCustomBaseUrl/multiapicustombaseurl/_serialization.py
+++ b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiCustomBaseUrl/multiapicustombaseurl/_serialization.py
@@ -184,73 +184,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2050,7 +1984,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiDataPlane/multiapidataplane/_serialization.py b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiDataPlane/multiapidataplane/_serialization.py
index a94487cbf17..13217d075d8 100644
--- a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiDataPlane/multiapidataplane/_serialization.py
+++ b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiDataPlane/multiapidataplane/_serialization.py
@@ -184,73 +184,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2050,7 +1984,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiKeywordOnly/multiapikeywordonly/_serialization.py b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiKeywordOnly/multiapikeywordonly/_serialization.py
index a94487cbf17..13217d075d8 100644
--- a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiKeywordOnly/multiapikeywordonly/_serialization.py
+++ b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiKeywordOnly/multiapikeywordonly/_serialization.py
@@ -184,73 +184,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2050,7 +1984,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiNoAsync/multiapinoasync/_serialization.py b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiNoAsync/multiapinoasync/_serialization.py
index a94487cbf17..13217d075d8 100644
--- a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiNoAsync/multiapinoasync/_serialization.py
+++ b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiNoAsync/multiapinoasync/_serialization.py
@@ -184,73 +184,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2050,7 +1984,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiSecurity/multiapisecurity/_serialization.py b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiSecurity/multiapisecurity/_serialization.py
index a94487cbf17..13217d075d8 100644
--- a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiSecurity/multiapisecurity/_serialization.py
+++ b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiSecurity/multiapisecurity/_serialization.py
@@ -184,73 +184,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2050,7 +1984,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiWithSubmodule/multiapiwithsubmodule/submodule/_serialization.py b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiWithSubmodule/multiapiwithsubmodule/submodule/_serialization.py
index a94487cbf17..13217d075d8 100644
--- a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiWithSubmodule/multiapiwithsubmodule/submodule/_serialization.py
+++ b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/MultiapiWithSubmodule/multiapiwithsubmodule/submodule/_serialization.py
@@ -184,73 +184,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2050,7 +1984,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/multiapicombiner/multiapicombiner/_serialization.py b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/multiapicombiner/multiapicombiner/_serialization.py
index a94487cbf17..13217d075d8 100644
--- a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/multiapicombiner/multiapicombiner/_serialization.py
+++ b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/multiapicombiner/multiapicombiner/_serialization.py
@@ -184,73 +184,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2050,7 +1984,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/multiapicombiner/multiapicombiner/aio/operations/_operations.py b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/multiapicombiner/multiapicombiner/aio/operations/_operations.py
index c3992e19425..6b30287746e 100644
--- a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/multiapicombiner/multiapicombiner/aio/operations/_operations.py
+++ b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/multiapicombiner/multiapicombiner/aio/operations/_operations.py
@@ -61,13 +61,13 @@
 class OperationGroupOneOperations:
     """
     
-    .. warning::
-        **DO NOT** instantiate this class directly.
+.. warning::
+    **DO NOT** instantiate this class directly.
+
+    Instead, you should access the following operations through
+    :class:`~multiapicombiner.v3.aio.MultiapiServiceClient`'s
+    :attr:`operation_group_one` attribute.
 
-        Instead, you should access the following operations through
-        :class:`~multiapicombiner.v3.aio.MultiapiServiceClient`'s
-        :attr:`operation_group_one` attribute.
-    
     """
     models = _models
 
@@ -278,13 +278,13 @@ async def get_next(next_link=None):
 class OperationGroupTwoOperations:
     """
     
-    .. warning::
-        **DO NOT** instantiate this class directly.
+.. warning::
+    **DO NOT** instantiate this class directly.
+
+    Instead, you should access the following operations through
+    :class:`~multiapicombiner.v3.aio.MultiapiServiceClient`'s
+    :attr:`operation_group_two` attribute.
 
-        Instead, you should access the following operations through
-        :class:`~multiapicombiner.v3.aio.MultiapiServiceClient`'s
-        :attr:`operation_group_two` attribute.
-    
     """
     models = _models
 
diff --git a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/multiapicombiner/multiapicombiner/operations/_operations.py b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/multiapicombiner/multiapicombiner/operations/_operations.py
index f0a399d0445..9452f4c6e36 100644
--- a/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/multiapicombiner/multiapicombiner/operations/_operations.py
+++ b/packages/autorest.python/test/multiapi/Expected/AcceptanceTests/multiapicombiner/multiapicombiner/operations/_operations.py
@@ -106,13 +106,13 @@ def build_operation_group_one_test_operation_group_paging_request(  # pylint: di
 class OperationGroupOneOperations:
     """
     
-    .. warning::
-        **DO NOT** instantiate this class directly.
+.. warning::
+    **DO NOT** instantiate this class directly.
+
+    Instead, you should access the following operations through
+    :class:`~multiapicombiner.v3.MultiapiServiceClient`'s
+    :attr:`operation_group_one` attribute.
 
-        Instead, you should access the following operations through
-        :class:`~multiapicombiner.v3.MultiapiServiceClient`'s
-        :attr:`operation_group_one` attribute.
-    
     """
     models = _models
 
@@ -362,13 +362,13 @@ def build_operation_group_two_test_five_request(**kwargs: Any) -> HttpRequest:
 class OperationGroupTwoOperations:
     """
     
-    .. warning::
-        **DO NOT** instantiate this class directly.
+.. warning::
+    **DO NOT** instantiate this class directly.
+
+    Instead, you should access the following operations through
+    :class:`~multiapicombiner.v3.MultiapiServiceClient`'s
+    :attr:`operation_group_two` attribute.
 
-        Instead, you should access the following operations through
-        :class:`~multiapicombiner.v3.MultiapiServiceClient`'s
-        :attr:`operation_group_two` attribute.
-    
     """
     models = _models
 
diff --git a/packages/autorest.python/test/unittests/storage_models/serialization.py b/packages/autorest.python/test/unittests/storage_models/serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/unittests/storage_models/serialization.py
+++ b/packages/autorest.python/test/unittests/storage_models/serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/AdditionalProperties/additionalproperties/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/AdditionalProperties/additionalproperties/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/AdditionalProperties/additionalproperties/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/AdditionalProperties/additionalproperties/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Anything/anything/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Anything/anything/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Anything/anything/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Anything/anything/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyArray/bodyarray/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyArray/bodyarray/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyArray/bodyarray/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyArray/bodyarray/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyArrayWithNamespaceFolders/vanilla/body/array/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyArrayWithNamespaceFolders/vanilla/body/array/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyArrayWithNamespaceFolders/vanilla/body/array/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyArrayWithNamespaceFolders/vanilla/body/array/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyBinary/bodybinary/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyBinary/bodybinary/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyBinary/bodybinary/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyBinary/bodybinary/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyBoolean/bodyboolean/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyBoolean/bodyboolean/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyBoolean/bodyboolean/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyBoolean/bodyboolean/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyByte/bodybyte/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyByte/bodybyte/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyByte/bodybyte/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyByte/bodybyte/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyByteWithPackageName/bodybytewithpackagename/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyByteWithPackageName/bodybytewithpackagename/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyByteWithPackageName/bodybytewithpackagename/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyByteWithPackageName/bodybytewithpackagename/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDate/bodydate/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDate/bodydate/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDate/bodydate/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDate/bodydate/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDateTime/bodydatetime/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDateTime/bodydatetime/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDateTime/bodydatetime/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDateTime/bodydatetime/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDateTimeRfc1123/bodydatetimerfc1123/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDateTimeRfc1123/bodydatetimerfc1123/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDateTimeRfc1123/bodydatetimerfc1123/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDateTimeRfc1123/bodydatetimerfc1123/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDictionary/bodydictionary/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDictionary/bodydictionary/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDictionary/bodydictionary/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDictionary/bodydictionary/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDuration/bodyduration/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDuration/bodyduration/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDuration/bodyduration/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyDuration/bodyduration/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyFile/bodyfile/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyFile/bodyfile/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyFile/bodyfile/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyFile/bodyfile/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyFormData/bodyformdata/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyFormData/bodyformdata/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyFormData/bodyformdata/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyFormData/bodyformdata/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyFormUrlEncodedData/bodyformurlencodeddata/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyFormUrlEncodedData/bodyformurlencodeddata/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyFormUrlEncodedData/bodyformurlencodeddata/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyFormUrlEncodedData/bodyformurlencodeddata/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyInteger/bodyinteger/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyInteger/bodyinteger/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyInteger/bodyinteger/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyInteger/bodyinteger/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyNumber/bodynumber/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyNumber/bodynumber/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyNumber/bodynumber/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyNumber/bodynumber/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyString/bodystring/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyString/bodystring/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyString/bodystring/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyString/bodystring/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyTime/bodytime/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyTime/bodytime/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyTime/bodytime/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/BodyTime/bodytime/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ClientEnum/clientenum/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ClientEnum/clientenum/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ClientEnum/clientenum/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ClientEnum/clientenum/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Constants/constants/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Constants/constants/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Constants/constants/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Constants/constants/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/CustomBaseUriMoreOptions/custombaseurlmoreoptions/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/CustomBaseUriMoreOptions/custombaseurlmoreoptions/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/CustomBaseUriMoreOptions/custombaseurlmoreoptions/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/CustomBaseUriMoreOptions/custombaseurlmoreoptions/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ErrorWithSecrets/errorwithsecrets/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ErrorWithSecrets/errorwithsecrets/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ErrorWithSecrets/errorwithsecrets/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ErrorWithSecrets/errorwithsecrets/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ExtensibleEnums/extensibleenumsswagger/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ExtensibleEnums/extensibleenumsswagger/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ExtensibleEnums/extensibleenumsswagger/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ExtensibleEnums/extensibleenumsswagger/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Header/header/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Header/header/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Header/header/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Header/header/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Http/httpinfrastructure/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Http/httpinfrastructure/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Http/httpinfrastructure/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Http/httpinfrastructure/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/IncorrectErrorResponse/incorrecterrorresponse/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/IncorrectErrorResponse/incorrecterrorresponse/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/IncorrectErrorResponse/incorrecterrorresponse/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/IncorrectErrorResponse/incorrecterrorresponse/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/InternalOperation/internaloperation/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/InternalOperation/internaloperation/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/InternalOperation/internaloperation/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/InternalOperation/internaloperation/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/MediaTypes/mediatypes/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/MediaTypes/mediatypes/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/MediaTypes/mediatypes/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/MediaTypes/mediatypes/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/MergePatchJson/mergepatchjson/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/MergePatchJson/mergepatchjson/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/MergePatchJson/mergepatchjson/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/MergePatchJson/mergepatchjson/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ModelFlattening/modelflattening/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ModelFlattening/modelflattening/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ModelFlattening/modelflattening/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ModelFlattening/modelflattening/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/MultipleInheritance/multipleinheritance/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/MultipleInheritance/multipleinheritance/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/MultipleInheritance/multipleinheritance/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/MultipleInheritance/multipleinheritance/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/NoOperations/nooperations/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/NoOperations/nooperations/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/NoOperations/nooperations/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/NoOperations/nooperations/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/NonStringEnums/nonstringenums/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/NonStringEnums/nonstringenums/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/NonStringEnums/nonstringenums/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/NonStringEnums/nonstringenums/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ObjectType/objecttype/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ObjectType/objecttype/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ObjectType/objecttype/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ObjectType/objecttype/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/PackageModeDataPlane/packagemode/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/PackageModeDataPlane/packagemode/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/PackageModeDataPlane/packagemode/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/PackageModeDataPlane/packagemode/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ParameterFlattening/parameterflattening/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ParameterFlattening/parameterflattening/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ParameterFlattening/parameterflattening/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ParameterFlattening/parameterflattening/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ParameterizedEndpoint/parameterizedendpoint/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ParameterizedEndpoint/parameterizedendpoint/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ParameterizedEndpoint/parameterizedendpoint/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ParameterizedEndpoint/parameterizedendpoint/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Report/report/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Report/report/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Report/report/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Report/report/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ReservedWords/reservedwords/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ReservedWords/reservedwords/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ReservedWords/reservedwords/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/ReservedWords/reservedwords/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityAadSwagger/securityaadswagger/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityAadSwagger/securityaadswagger/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityAadSwagger/securityaadswagger/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityAadSwagger/securityaadswagger/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityAadSwaggerCredentialFlag/securityaadswaggercredentialflag/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityAadSwaggerCredentialFlag/securityaadswaggercredentialflag/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityAadSwaggerCredentialFlag/securityaadswaggercredentialflag/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityAadSwaggerCredentialFlag/securityaadswaggercredentialflag/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityKeySwagger/securitykeyswagger/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityKeySwagger/securitykeyswagger/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityKeySwagger/securitykeyswagger/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityKeySwagger/securitykeyswagger/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityKeySwaggerCredentialFlag/securitykeyswaggercredentialflag/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityKeySwaggerCredentialFlag/securitykeyswaggercredentialflag/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityKeySwaggerCredentialFlag/securitykeyswaggercredentialflag/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/SecurityKeySwaggerCredentialFlag/securitykeyswaggercredentialflag/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/UrlMultiCollectionFormat/urlmulticollectionformat/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/UrlMultiCollectionFormat/urlmulticollectionformat/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/UrlMultiCollectionFormat/urlmulticollectionformat/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/UrlMultiCollectionFormat/urlmulticollectionformat/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Xml/xmlservice/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Xml/xmlservice/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Xml/xmlservice/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/Xml/xmlservice/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/XmsErrorResponse/xmserrorresponse/_serialization.py b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/XmsErrorResponse/xmserrorresponse/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/XmsErrorResponse/xmserrorresponse/_serialization.py
+++ b/packages/autorest.python/test/vanilla/legacy/Expected/AcceptanceTests/XmsErrorResponse/xmserrorresponse/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/AdditionalPropertiesVersionTolerant/additionalpropertiesversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/AdditionalPropertiesVersionTolerant/additionalpropertiesversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/AdditionalPropertiesVersionTolerant/additionalpropertiesversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/AdditionalPropertiesVersionTolerant/additionalpropertiesversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/AnythingVersionTolerant/anythingversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/AnythingVersionTolerant/anythingversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/AnythingVersionTolerant/anythingversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/AnythingVersionTolerant/anythingversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyArrayVersionTolerant/bodyarrayversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyArrayVersionTolerant/bodyarrayversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyArrayVersionTolerant/bodyarrayversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyArrayVersionTolerant/bodyarrayversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyBinaryVersionTolerant/bodybinaryversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyBinaryVersionTolerant/bodybinaryversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyBinaryVersionTolerant/bodybinaryversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyBinaryVersionTolerant/bodybinaryversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyBooleanVersionTolerant/bodybooleanversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyBooleanVersionTolerant/bodybooleanversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyBooleanVersionTolerant/bodybooleanversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyBooleanVersionTolerant/bodybooleanversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyByteVersionTolerant/bodybyteversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyByteVersionTolerant/bodybyteversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyByteVersionTolerant/bodybyteversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyByteVersionTolerant/bodybyteversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyComplexVersionTolerant/bodycomplexversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyComplexVersionTolerant/bodycomplexversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyComplexVersionTolerant/bodycomplexversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyComplexVersionTolerant/bodycomplexversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDateTimeRfc1123VersionTolerant/bodydatetimerfc1123versiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDateTimeRfc1123VersionTolerant/bodydatetimerfc1123versiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDateTimeRfc1123VersionTolerant/bodydatetimerfc1123versiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDateTimeRfc1123VersionTolerant/bodydatetimerfc1123versiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDateTimeVersionTolerant/bodydatetimeversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDateTimeVersionTolerant/bodydatetimeversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDateTimeVersionTolerant/bodydatetimeversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDateTimeVersionTolerant/bodydatetimeversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDateVersionTolerant/bodydateversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDateVersionTolerant/bodydateversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDateVersionTolerant/bodydateversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDateVersionTolerant/bodydateversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDictionaryVersionTolerant/bodydictionaryversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDictionaryVersionTolerant/bodydictionaryversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDictionaryVersionTolerant/bodydictionaryversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDictionaryVersionTolerant/bodydictionaryversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDurationVersionTolerant/bodydurationversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDurationVersionTolerant/bodydurationversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDurationVersionTolerant/bodydurationversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyDurationVersionTolerant/bodydurationversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyFileVersionTolerant/bodyfileversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyFileVersionTolerant/bodyfileversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyFileVersionTolerant/bodyfileversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyFileVersionTolerant/bodyfileversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyFormDataVersionTolerant/bodyformdataversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyFormDataVersionTolerant/bodyformdataversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyFormDataVersionTolerant/bodyformdataversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyFormDataVersionTolerant/bodyformdataversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyFormUrlEncodedDataVersionTolerant/bodyformurlencodeddataversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyFormUrlEncodedDataVersionTolerant/bodyformurlencodeddataversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyFormUrlEncodedDataVersionTolerant/bodyformurlencodeddataversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyFormUrlEncodedDataVersionTolerant/bodyformurlencodeddataversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyIntegerVersionTolerant/bodyintegerversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyIntegerVersionTolerant/bodyintegerversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyIntegerVersionTolerant/bodyintegerversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyIntegerVersionTolerant/bodyintegerversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyNumberVersionTolerant/bodynumberversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyNumberVersionTolerant/bodynumberversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyNumberVersionTolerant/bodynumberversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyNumberVersionTolerant/bodynumberversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyStringVersionTolerant/bodystringversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyStringVersionTolerant/bodystringversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyStringVersionTolerant/bodystringversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyStringVersionTolerant/bodystringversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyTimeVersionTolerant/bodytimeversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyTimeVersionTolerant/bodytimeversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyTimeVersionTolerant/bodytimeversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/BodyTimeVersionTolerant/bodytimeversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ClientEnumVersionTolerant/clientenumversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ClientEnumVersionTolerant/clientenumversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ClientEnumVersionTolerant/clientenumversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ClientEnumVersionTolerant/clientenumversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ConstantsVersionTolerant/constantsversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ConstantsVersionTolerant/constantsversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ConstantsVersionTolerant/constantsversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ConstantsVersionTolerant/constantsversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/CustomBaseUriMoreOptionsVersionTolerant/custombaseurlmoreoptionsversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/CustomBaseUriMoreOptionsVersionTolerant/custombaseurlmoreoptionsversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/CustomBaseUriMoreOptionsVersionTolerant/custombaseurlmoreoptionsversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/CustomBaseUriMoreOptionsVersionTolerant/custombaseurlmoreoptionsversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/CustomBaseUriVersionTolerant/custombaseurlversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/CustomBaseUriVersionTolerant/custombaseurlversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/CustomBaseUriVersionTolerant/custombaseurlversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/CustomBaseUriVersionTolerant/custombaseurlversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ErrorWithSecretsVersionTolerant/errorwithsecretsversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ErrorWithSecretsVersionTolerant/errorwithsecretsversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ErrorWithSecretsVersionTolerant/errorwithsecretsversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ErrorWithSecretsVersionTolerant/errorwithsecretsversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ExtensibleEnumsVersionTolerant/extensibleenumsswaggerversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ExtensibleEnumsVersionTolerant/extensibleenumsswaggerversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ExtensibleEnumsVersionTolerant/extensibleenumsswaggerversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ExtensibleEnumsVersionTolerant/extensibleenumsswaggerversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/HeaderVersionTolerant/headerversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/HeaderVersionTolerant/headerversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/HeaderVersionTolerant/headerversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/HeaderVersionTolerant/headerversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/HttpVersionTolerant/httpinfrastructureversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/HttpVersionTolerant/httpinfrastructureversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/HttpVersionTolerant/httpinfrastructureversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/HttpVersionTolerant/httpinfrastructureversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/IncorrectErrorResponseVersionTolerant/incorrecterrorresponseversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/IncorrectErrorResponseVersionTolerant/incorrecterrorresponseversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/IncorrectErrorResponseVersionTolerant/incorrecterrorresponseversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/IncorrectErrorResponseVersionTolerant/incorrecterrorresponseversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/MediaTypesVersionTolerant/mediatypesversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/MediaTypesVersionTolerant/mediatypesversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/MediaTypesVersionTolerant/mediatypesversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/MediaTypesVersionTolerant/mediatypesversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/MergePatchJsonVersionTolerant/mergepatchjsonversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/MergePatchJsonVersionTolerant/mergepatchjsonversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/MergePatchJsonVersionTolerant/mergepatchjsonversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/MergePatchJsonVersionTolerant/mergepatchjsonversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ModelFlatteningVersionTolerant/modelflatteningversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ModelFlatteningVersionTolerant/modelflatteningversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ModelFlatteningVersionTolerant/modelflatteningversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ModelFlatteningVersionTolerant/modelflatteningversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/MultipleInheritanceVersionTolerant/multipleinheritanceversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/MultipleInheritanceVersionTolerant/multipleinheritanceversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/MultipleInheritanceVersionTolerant/multipleinheritanceversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/MultipleInheritanceVersionTolerant/multipleinheritanceversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/NoNamespaceFlagVersionTolerant/anything_client/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/NoNamespaceFlagVersionTolerant/anything_client/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/NoNamespaceFlagVersionTolerant/anything_client/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/NoNamespaceFlagVersionTolerant/anything_client/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/NoOperationsVersionTolerant/nooperationsversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/NoOperationsVersionTolerant/nooperationsversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/NoOperationsVersionTolerant/nooperationsversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/NoOperationsVersionTolerant/nooperationsversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/NonStringEnumsVersionTolerant/nonstringenumsversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/NonStringEnumsVersionTolerant/nonstringenumsversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/NonStringEnumsVersionTolerant/nonstringenumsversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/NonStringEnumsVersionTolerant/nonstringenumsversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ObjectTypeVersionTolerant/objecttypeversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ObjectTypeVersionTolerant/objecttypeversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ObjectTypeVersionTolerant/objecttypeversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ObjectTypeVersionTolerant/objecttypeversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ParameterFlatteningVersionTolerant/parameterflatteningversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ParameterFlatteningVersionTolerant/parameterflatteningversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ParameterFlatteningVersionTolerant/parameterflatteningversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ParameterFlatteningVersionTolerant/parameterflatteningversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ParameterizedEndpointVersionTolerant/parameterizedendpointversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ParameterizedEndpointVersionTolerant/parameterizedendpointversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ParameterizedEndpointVersionTolerant/parameterizedendpointversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ParameterizedEndpointVersionTolerant/parameterizedendpointversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ReportVersionTolerant/reportversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ReportVersionTolerant/reportversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ReportVersionTolerant/reportversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ReportVersionTolerant/reportversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/RequiredOptionalVersionTolerant/requiredoptionalversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/RequiredOptionalVersionTolerant/requiredoptionalversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/RequiredOptionalVersionTolerant/requiredoptionalversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/RequiredOptionalVersionTolerant/requiredoptionalversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ReservedWordsVersionTolerant/reservedwordsversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ReservedWordsVersionTolerant/reservedwordsversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ReservedWordsVersionTolerant/reservedwordsversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ReservedWordsVersionTolerant/reservedwordsversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/SecurityAadSwaggerVersionTolerant/securityaadswaggerversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/SecurityAadSwaggerVersionTolerant/securityaadswaggerversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/SecurityAadSwaggerVersionTolerant/securityaadswaggerversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/SecurityAadSwaggerVersionTolerant/securityaadswaggerversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/SecurityKeySwaggerVersionTolerant/securitykeyswaggerversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/SecurityKeySwaggerVersionTolerant/securitykeyswaggerversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/SecurityKeySwaggerVersionTolerant/securitykeyswaggerversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/SecurityKeySwaggerVersionTolerant/securitykeyswaggerversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/UrlMultiCollectionFormatVersionTolerant/urlmulticollectionformatversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/UrlMultiCollectionFormatVersionTolerant/urlmulticollectionformatversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/UrlMultiCollectionFormatVersionTolerant/urlmulticollectionformatversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/UrlMultiCollectionFormatVersionTolerant/urlmulticollectionformatversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/UrlVersionTolerant/urlversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/UrlVersionTolerant/urlversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/UrlVersionTolerant/urlversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/UrlVersionTolerant/urlversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ValidationVersionTolerant/validationversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ValidationVersionTolerant/validationversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ValidationVersionTolerant/validationversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/ValidationVersionTolerant/validationversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmlVersionTolerant/xmlserviceversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmlVersionTolerant/xmlserviceversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmlVersionTolerant/xmlserviceversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmlVersionTolerant/xmlserviceversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmsErrorResponseVersionTolerant/xmserrorresponseversiontolerant/_serialization.py b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmsErrorResponseVersionTolerant/xmserrorresponseversiontolerant/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmsErrorResponseVersionTolerant/xmserrorresponseversiontolerant/_serialization.py
+++ b/packages/autorest.python/test/vanilla/version-tolerant/Expected/AcceptanceTests/XmsErrorResponseVersionTolerant/xmserrorresponseversiontolerant/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/package.json b/packages/typespec-python/package.json
index 6c8e43bb239..73c69dbc013 100644
--- a/packages/typespec-python/package.json
+++ b/packages/typespec-python/package.json
@@ -60,7 +60,7 @@
     "js-yaml": "~4.1.0",
     "semver": "~7.6.2",
     "tsx": "~4.19.1",
-    "@typespec/http-client-python": "~0.6.2",
+    "@typespec/http-client-python": "https://artprodcus3.artifacts.visualstudio.com/A0fb41ef4-5012-48a9-bf39-4ee3de03ee35/29ec6040-b234-4e31-b139-33dc4287b756/_apis/artifact/cGlwZWxpbmVhcnRpZmFjdDovL2F6dXJlLXNkay9wcm9qZWN0SWQvMjllYzYwNDAtYjIzNC00ZTMxLWIxMzktMzNkYzQyODdiNzU2L2J1aWxkSWQvNDQ3NjI5MC9hcnRpZmFjdE5hbWUvYnVpbGRfYXJ0aWZhY3RzX3B5dGhvbg2/content?format=file&subPath=%2Fpackages%2Ftypespec-http-client-python-0.6.3.tgz",
     "fs-extra": "~11.2.0"
   },
   "devDependencies": {
diff --git a/packages/typespec-python/test/azure/generated/authentication-api-key/authentication/apikey/_serialization.py b/packages/typespec-python/test/azure/generated/authentication-api-key/authentication/apikey/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/authentication-api-key/authentication/apikey/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/authentication-api-key/authentication/apikey/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/authentication-http-custom/authentication/http/custom/_serialization.py b/packages/typespec-python/test/azure/generated/authentication-http-custom/authentication/http/custom/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/authentication-http-custom/authentication/http/custom/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/authentication-http-custom/authentication/http/custom/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/authentication-oauth2/authentication/oauth2/_serialization.py b/packages/typespec-python/test/azure/generated/authentication-oauth2/authentication/oauth2/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/authentication-oauth2/authentication/oauth2/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/authentication-oauth2/authentication/oauth2/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/authentication-union/authentication/union/_serialization.py b/packages/typespec-python/test/azure/generated/authentication-union/authentication/union/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/authentication-union/authentication/union/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/authentication-union/authentication/union/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-client-generator-core-access/specs/azure/clientgenerator/core/access/_serialization.py b/packages/typespec-python/test/azure/generated/azure-client-generator-core-access/specs/azure/clientgenerator/core/access/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-client-generator-core-access/specs/azure/clientgenerator/core/access/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-client-generator-core-access/specs/azure/clientgenerator/core/access/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-client-generator-core-flatten-property/specs/azure/clientgenerator/core/flattenproperty/_serialization.py b/packages/typespec-python/test/azure/generated/azure-client-generator-core-flatten-property/specs/azure/clientgenerator/core/flattenproperty/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-client-generator-core-flatten-property/specs/azure/clientgenerator/core/flattenproperty/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-client-generator-core-flatten-property/specs/azure/clientgenerator/core/flattenproperty/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-client-generator-core-usage/specs/azure/clientgenerator/core/usage/_serialization.py b/packages/typespec-python/test/azure/generated/azure-client-generator-core-usage/specs/azure/clientgenerator/core/usage/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-client-generator-core-usage/specs/azure/clientgenerator/core/usage/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-client-generator-core-usage/specs/azure/clientgenerator/core/usage/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-core-basic/specs/azure/core/basic/_serialization.py b/packages/typespec-python/test/azure/generated/azure-core-basic/specs/azure/core/basic/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-core-basic/specs/azure/core/basic/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-core-basic/specs/azure/core/basic/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-core-lro-standard/specs/azure/core/lro/standard/_serialization.py b/packages/typespec-python/test/azure/generated/azure-core-lro-standard/specs/azure/core/lro/standard/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-core-lro-standard/specs/azure/core/lro/standard/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-core-lro-standard/specs/azure/core/lro/standard/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-core-model/specs/azure/core/model/_serialization.py b/packages/typespec-python/test/azure/generated/azure-core-model/specs/azure/core/model/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-core-model/specs/azure/core/model/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-core-model/specs/azure/core/model/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-core-page/specs/azure/core/page/_serialization.py b/packages/typespec-python/test/azure/generated/azure-core-page/specs/azure/core/page/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-core-page/specs/azure/core/page/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-core-page/specs/azure/core/page/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-core-scalar/specs/azure/core/scalar/_serialization.py b/packages/typespec-python/test/azure/generated/azure-core-scalar/specs/azure/core/scalar/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-core-scalar/specs/azure/core/scalar/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-core-scalar/specs/azure/core/scalar/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-core-traits/specs/azure/core/traits/_serialization.py b/packages/typespec-python/test/azure/generated/azure-core-traits/specs/azure/core/traits/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-core-traits/specs/azure/core/traits/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-core-traits/specs/azure/core/traits/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-example-basic/specs/azure/example/basic/_serialization.py b/packages/typespec-python/test/azure/generated/azure-example-basic/specs/azure/example/basic/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-example-basic/specs/azure/example/basic/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-example-basic/specs/azure/example/basic/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-payload-pageable/specs/azure/payload/pageable/_serialization.py b/packages/typespec-python/test/azure/generated/azure-payload-pageable/specs/azure/payload/pageable/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-payload-pageable/specs/azure/payload/pageable/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-payload-pageable/specs/azure/payload/pageable/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-resource-manager-common-properties/azure/resourcemanager/commonproperties/_serialization.py b/packages/typespec-python/test/azure/generated/azure-resource-manager-common-properties/azure/resourcemanager/commonproperties/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-resource-manager-common-properties/azure/resourcemanager/commonproperties/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-resource-manager-common-properties/azure/resourcemanager/commonproperties/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-resource-manager-operation-templates/azure/resourcemanager/operationtemplates/_serialization.py b/packages/typespec-python/test/azure/generated/azure-resource-manager-operation-templates/azure/resourcemanager/operationtemplates/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-resource-manager-operation-templates/azure/resourcemanager/operationtemplates/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-resource-manager-operation-templates/azure/resourcemanager/operationtemplates/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-resource-manager-resources/azure/resourcemanager/resources/_serialization.py b/packages/typespec-python/test/azure/generated/azure-resource-manager-resources/azure/resourcemanager/resources/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-resource-manager-resources/azure/resourcemanager/resources/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-resource-manager-resources/azure/resourcemanager/resources/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azure-special-headers-client-request-id/azure/specialheaders/xmsclientrequestid/_serialization.py b/packages/typespec-python/test/azure/generated/azure-special-headers-client-request-id/azure/specialheaders/xmsclientrequestid/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azure-special-headers-client-request-id/azure/specialheaders/xmsclientrequestid/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azure-special-headers-client-request-id/azure/specialheaders/xmsclientrequestid/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/azurecore-lro-rpc/azurecore/lro/rpc/_serialization.py b/packages/typespec-python/test/azure/generated/azurecore-lro-rpc/azurecore/lro/rpc/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/azurecore-lro-rpc/azurecore/lro/rpc/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/azurecore-lro-rpc/azurecore/lro/rpc/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/client-naming/client/naming/_serialization.py b/packages/typespec-python/test/azure/generated/client-naming/client/naming/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/client-naming/client/naming/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/client-naming/client/naming/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/client-structure-default/client/structure/service/_serialization.py b/packages/typespec-python/test/azure/generated/client-structure-default/client/structure/service/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/client-structure-default/client/structure/service/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/client-structure-default/client/structure/service/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/client-structure-multiclient/client/structure/multiclient/_serialization.py b/packages/typespec-python/test/azure/generated/client-structure-multiclient/client/structure/multiclient/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/client-structure-multiclient/client/structure/multiclient/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/client-structure-multiclient/client/structure/multiclient/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/client-structure-renamedoperation/client/structure/renamedoperation/_serialization.py b/packages/typespec-python/test/azure/generated/client-structure-renamedoperation/client/structure/renamedoperation/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/client-structure-renamedoperation/client/structure/renamedoperation/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/client-structure-renamedoperation/client/structure/renamedoperation/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/client-structure-twooperationgroup/client/structure/twooperationgroup/_serialization.py b/packages/typespec-python/test/azure/generated/client-structure-twooperationgroup/client/structure/twooperationgroup/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/client-structure-twooperationgroup/client/structure/twooperationgroup/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/client-structure-twooperationgroup/client/structure/twooperationgroup/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/encode-bytes/encode/bytes/_serialization.py b/packages/typespec-python/test/azure/generated/encode-bytes/encode/bytes/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/encode-bytes/encode/bytes/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/encode-bytes/encode/bytes/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/encode-datetime/encode/datetime/_serialization.py b/packages/typespec-python/test/azure/generated/encode-datetime/encode/datetime/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/encode-datetime/encode/datetime/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/encode-datetime/encode/datetime/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/encode-duration/encode/duration/_serialization.py b/packages/typespec-python/test/azure/generated/encode-duration/encode/duration/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/encode-duration/encode/duration/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/encode-duration/encode/duration/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/encode-numeric/encode/numeric/_serialization.py b/packages/typespec-python/test/azure/generated/encode-numeric/encode/numeric/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/encode-numeric/encode/numeric/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/encode-numeric/encode/numeric/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/headasbooleanfalse/headasbooleanfalse/_serialization.py b/packages/typespec-python/test/azure/generated/headasbooleanfalse/headasbooleanfalse/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/headasbooleanfalse/headasbooleanfalse/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/headasbooleanfalse/headasbooleanfalse/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/headasbooleantrue/headasbooleantrue/_serialization.py b/packages/typespec-python/test/azure/generated/headasbooleantrue/headasbooleantrue/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/headasbooleantrue/headasbooleantrue/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/headasbooleantrue/headasbooleantrue/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/parameters-basic/parameters/basic/_serialization.py b/packages/typespec-python/test/azure/generated/parameters-basic/parameters/basic/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/parameters-basic/parameters/basic/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/parameters-basic/parameters/basic/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/parameters-body-optionality/parameters/bodyoptionality/_serialization.py b/packages/typespec-python/test/azure/generated/parameters-body-optionality/parameters/bodyoptionality/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/parameters-body-optionality/parameters/bodyoptionality/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/parameters-body-optionality/parameters/bodyoptionality/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/parameters-collection-format/parameters/collectionformat/_serialization.py b/packages/typespec-python/test/azure/generated/parameters-collection-format/parameters/collectionformat/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/parameters-collection-format/parameters/collectionformat/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/parameters-collection-format/parameters/collectionformat/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/parameters-spread/parameters/spread/_serialization.py b/packages/typespec-python/test/azure/generated/parameters-spread/parameters/spread/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/parameters-spread/parameters/spread/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/parameters-spread/parameters/spread/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/payload-content-negotiation/payload/contentnegotiation/_serialization.py b/packages/typespec-python/test/azure/generated/payload-content-negotiation/payload/contentnegotiation/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/payload-content-negotiation/payload/contentnegotiation/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/payload-content-negotiation/payload/contentnegotiation/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/payload-json-merge-patch/payload/jsonmergepatch/_serialization.py b/packages/typespec-python/test/azure/generated/payload-json-merge-patch/payload/jsonmergepatch/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/payload-json-merge-patch/payload/jsonmergepatch/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/payload-json-merge-patch/payload/jsonmergepatch/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/payload-media-type/payload/mediatype/_serialization.py b/packages/typespec-python/test/azure/generated/payload-media-type/payload/mediatype/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/payload-media-type/payload/mediatype/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/payload-media-type/payload/mediatype/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/payload-multipart/payload/multipart/_serialization.py b/packages/typespec-python/test/azure/generated/payload-multipart/payload/multipart/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/payload-multipart/payload/multipart/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/payload-multipart/payload/multipart/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/payload-pageable/payload/pageable/_serialization.py b/packages/typespec-python/test/azure/generated/payload-pageable/payload/pageable/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/payload-pageable/payload/pageable/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/payload-pageable/payload/pageable/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/payload-xml/payload/xml/_serialization.py b/packages/typespec-python/test/azure/generated/payload-xml/payload/xml/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/payload-xml/payload/xml/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/payload-xml/payload/xml/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/resiliency-srv-driven1/resiliency/srv/driven1/_serialization.py b/packages/typespec-python/test/azure/generated/resiliency-srv-driven1/resiliency/srv/driven1/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/resiliency-srv-driven1/resiliency/srv/driven1/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/resiliency-srv-driven1/resiliency/srv/driven1/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/resiliency-srv-driven2/resiliency/srv/driven2/_serialization.py b/packages/typespec-python/test/azure/generated/resiliency-srv-driven2/resiliency/srv/driven2/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/resiliency-srv-driven2/resiliency/srv/driven2/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/resiliency-srv-driven2/resiliency/srv/driven2/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/routes/routes/_serialization.py b/packages/typespec-python/test/azure/generated/routes/routes/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/routes/routes/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/routes/routes/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/serialization-encoded-name-json/serialization/encodedname/json/_serialization.py b/packages/typespec-python/test/azure/generated/serialization-encoded-name-json/serialization/encodedname/json/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/serialization-encoded-name-json/serialization/encodedname/json/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/serialization-encoded-name-json/serialization/encodedname/json/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/server-endpoint-not-defined/server/endpoint/notdefined/_serialization.py b/packages/typespec-python/test/azure/generated/server-endpoint-not-defined/server/endpoint/notdefined/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/server-endpoint-not-defined/server/endpoint/notdefined/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/server-endpoint-not-defined/server/endpoint/notdefined/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/server-path-multiple/server/path/multiple/_serialization.py b/packages/typespec-python/test/azure/generated/server-path-multiple/server/path/multiple/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/server-path-multiple/server/path/multiple/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/server-path-multiple/server/path/multiple/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/server-path-single/server/path/single/_serialization.py b/packages/typespec-python/test/azure/generated/server-path-single/server/path/single/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/server-path-single/server/path/single/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/server-path-single/server/path/single/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/server-versions-not-versioned/server/versions/notversioned/_serialization.py b/packages/typespec-python/test/azure/generated/server-versions-not-versioned/server/versions/notversioned/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/server-versions-not-versioned/server/versions/notversioned/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/server-versions-not-versioned/server/versions/notversioned/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/server-versions-versioned/server/versions/versioned/_serialization.py b/packages/typespec-python/test/azure/generated/server-versions-versioned/server/versions/versioned/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/server-versions-versioned/server/versions/versioned/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/server-versions-versioned/server/versions/versioned/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/special-headers-conditional-request/specialheaders/conditionalrequest/_serialization.py b/packages/typespec-python/test/azure/generated/special-headers-conditional-request/specialheaders/conditionalrequest/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/special-headers-conditional-request/specialheaders/conditionalrequest/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/special-headers-conditional-request/specialheaders/conditionalrequest/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/special-headers-repeatability/specialheaders/repeatability/_serialization.py b/packages/typespec-python/test/azure/generated/special-headers-repeatability/specialheaders/repeatability/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/special-headers-repeatability/specialheaders/repeatability/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/special-headers-repeatability/specialheaders/repeatability/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/special-words/specialwords/_serialization.py b/packages/typespec-python/test/azure/generated/special-words/specialwords/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/special-words/specialwords/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/special-words/specialwords/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-array/typetest/array/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-array/typetest/array/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-array/typetest/array/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-array/typetest/array/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-dictionary/typetest/dictionary/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-dictionary/typetest/dictionary/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-dictionary/typetest/dictionary/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-dictionary/typetest/dictionary/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-enum-extensible/typetest/enum/extensible/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-enum-extensible/typetest/enum/extensible/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-enum-extensible/typetest/enum/extensible/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-enum-extensible/typetest/enum/extensible/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-enum-fixed/typetest/enum/fixed/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-enum-fixed/typetest/enum/fixed/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-enum-fixed/typetest/enum/fixed/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-enum-fixed/typetest/enum/fixed/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-model-empty/typetest/model/empty/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-model-empty/typetest/model/empty/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-model-empty/typetest/model/empty/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-model-empty/typetest/model/empty/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-model-enumdiscriminator/typetest/model/enumdiscriminator/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-model-enumdiscriminator/typetest/model/enumdiscriminator/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-model-enumdiscriminator/typetest/model/enumdiscriminator/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-model-enumdiscriminator/typetest/model/enumdiscriminator/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-model-nesteddiscriminator/typetest/model/nesteddiscriminator/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-model-nesteddiscriminator/typetest/model/nesteddiscriminator/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-model-nesteddiscriminator/typetest/model/nesteddiscriminator/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-model-nesteddiscriminator/typetest/model/nesteddiscriminator/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-model-notdiscriminated/typetest/model/notdiscriminated/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-model-notdiscriminated/typetest/model/notdiscriminated/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-model-notdiscriminated/typetest/model/notdiscriminated/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-model-notdiscriminated/typetest/model/notdiscriminated/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-model-recursive/typetest/model/recursive/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-model-recursive/typetest/model/recursive/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-model-recursive/typetest/model/recursive/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-model-recursive/typetest/model/recursive/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-model-singlediscriminator/typetest/model/singlediscriminator/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-model-singlediscriminator/typetest/model/singlediscriminator/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-model-singlediscriminator/typetest/model/singlediscriminator/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-model-singlediscriminator/typetest/model/singlediscriminator/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-model-usage/typetest/model/usage/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-model-usage/typetest/model/usage/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-model-usage/typetest/model/usage/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-model-usage/typetest/model/usage/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-model-visibility/typetest/model/visibility/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-model-visibility/typetest/model/visibility/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-model-visibility/typetest/model/visibility/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-model-visibility/typetest/model/visibility/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-property-additionalproperties/typetest/property/additionalproperties/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-property-additionalproperties/typetest/property/additionalproperties/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-property-additionalproperties/typetest/property/additionalproperties/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-property-additionalproperties/typetest/property/additionalproperties/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-property-nullable/typetest/property/nullable/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-property-nullable/typetest/property/nullable/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-property-nullable/typetest/property/nullable/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-property-nullable/typetest/property/nullable/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-property-optional/typetest/property/optional/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-property-optional/typetest/property/optional/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-property-optional/typetest/property/optional/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-property-optional/typetest/property/optional/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-property-valuetypes/typetest/property/valuetypes/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-property-valuetypes/typetest/property/valuetypes/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-property-valuetypes/typetest/property/valuetypes/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-property-valuetypes/typetest/property/valuetypes/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-scalar/typetest/scalar/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-scalar/typetest/scalar/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-scalar/typetest/scalar/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-scalar/typetest/scalar/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/typetest-union/typetest/union/_serialization.py b/packages/typespec-python/test/azure/generated/typetest-union/typetest/union/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/typetest-union/typetest/union/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/typetest-union/typetest/union/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/versioning-added/versioning/added/_serialization.py b/packages/typespec-python/test/azure/generated/versioning-added/versioning/added/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/versioning-added/versioning/added/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/versioning-added/versioning/added/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/versioning-madeoptional/versioning/madeoptional/_serialization.py b/packages/typespec-python/test/azure/generated/versioning-madeoptional/versioning/madeoptional/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/versioning-madeoptional/versioning/madeoptional/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/versioning-madeoptional/versioning/madeoptional/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/versioning-removed/versioning/removed/_serialization.py b/packages/typespec-python/test/azure/generated/versioning-removed/versioning/removed/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/versioning-removed/versioning/removed/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/versioning-removed/versioning/removed/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/versioning-renamedfrom/versioning/renamedfrom/_serialization.py b/packages/typespec-python/test/azure/generated/versioning-renamedfrom/versioning/renamedfrom/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/versioning-renamedfrom/versioning/renamedfrom/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/versioning-renamedfrom/versioning/renamedfrom/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/versioning-returntypechangedfrom/versioning/returntypechangedfrom/_serialization.py b/packages/typespec-python/test/azure/generated/versioning-returntypechangedfrom/versioning/returntypechangedfrom/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/versioning-returntypechangedfrom/versioning/returntypechangedfrom/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/versioning-returntypechangedfrom/versioning/returntypechangedfrom/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/azure/generated/versioning-typechangedfrom/versioning/typechangedfrom/_serialization.py b/packages/typespec-python/test/azure/generated/versioning-typechangedfrom/versioning/typechangedfrom/_serialization.py
index b24ab288545..670738f0789 100644
--- a/packages/typespec-python/test/azure/generated/versioning-typechangedfrom/versioning/typechangedfrom/_serialization.py
+++ b/packages/typespec-python/test/azure/generated/versioning-typechangedfrom/versioning/typechangedfrom/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/authentication-api-key/authentication/apikey/_serialization.py b/packages/typespec-python/test/unbranded/generated/authentication-api-key/authentication/apikey/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/authentication-api-key/authentication/apikey/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/authentication-api-key/authentication/apikey/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/authentication-http-custom/authentication/http/custom/_serialization.py b/packages/typespec-python/test/unbranded/generated/authentication-http-custom/authentication/http/custom/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/authentication-http-custom/authentication/http/custom/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/authentication-http-custom/authentication/http/custom/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/authentication-oauth2/authentication/oauth2/_serialization.py b/packages/typespec-python/test/unbranded/generated/authentication-oauth2/authentication/oauth2/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/authentication-oauth2/authentication/oauth2/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/authentication-oauth2/authentication/oauth2/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/authentication-union/authentication/union/_serialization.py b/packages/typespec-python/test/unbranded/generated/authentication-union/authentication/union/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/authentication-union/authentication/union/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/authentication-union/authentication/union/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/encode-bytes/encode/bytes/_serialization.py b/packages/typespec-python/test/unbranded/generated/encode-bytes/encode/bytes/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/encode-bytes/encode/bytes/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/encode-bytes/encode/bytes/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/encode-datetime/encode/datetime/_serialization.py b/packages/typespec-python/test/unbranded/generated/encode-datetime/encode/datetime/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/encode-datetime/encode/datetime/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/encode-datetime/encode/datetime/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/encode-duration/encode/duration/_serialization.py b/packages/typespec-python/test/unbranded/generated/encode-duration/encode/duration/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/encode-duration/encode/duration/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/encode-duration/encode/duration/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/encode-numeric/encode/numeric/_serialization.py b/packages/typespec-python/test/unbranded/generated/encode-numeric/encode/numeric/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/encode-numeric/encode/numeric/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/encode-numeric/encode/numeric/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/headasbooleanfalse/headasbooleanfalse/_serialization.py b/packages/typespec-python/test/unbranded/generated/headasbooleanfalse/headasbooleanfalse/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/headasbooleanfalse/headasbooleanfalse/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/headasbooleanfalse/headasbooleanfalse/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/headasbooleantrue/headasbooleantrue/_serialization.py b/packages/typespec-python/test/unbranded/generated/headasbooleantrue/headasbooleantrue/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/headasbooleantrue/headasbooleantrue/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/headasbooleantrue/headasbooleantrue/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/parameters-basic/parameters/basic/_serialization.py b/packages/typespec-python/test/unbranded/generated/parameters-basic/parameters/basic/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/parameters-basic/parameters/basic/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/parameters-basic/parameters/basic/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/parameters-body-optionality/parameters/bodyoptionality/_serialization.py b/packages/typespec-python/test/unbranded/generated/parameters-body-optionality/parameters/bodyoptionality/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/parameters-body-optionality/parameters/bodyoptionality/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/parameters-body-optionality/parameters/bodyoptionality/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/parameters-collection-format/parameters/collectionformat/_serialization.py b/packages/typespec-python/test/unbranded/generated/parameters-collection-format/parameters/collectionformat/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/parameters-collection-format/parameters/collectionformat/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/parameters-collection-format/parameters/collectionformat/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/parameters-spread/parameters/spread/_serialization.py b/packages/typespec-python/test/unbranded/generated/parameters-spread/parameters/spread/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/parameters-spread/parameters/spread/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/parameters-spread/parameters/spread/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/payload-content-negotiation/payload/contentnegotiation/_serialization.py b/packages/typespec-python/test/unbranded/generated/payload-content-negotiation/payload/contentnegotiation/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/payload-content-negotiation/payload/contentnegotiation/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/payload-content-negotiation/payload/contentnegotiation/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/payload-json-merge-patch/payload/jsonmergepatch/_serialization.py b/packages/typespec-python/test/unbranded/generated/payload-json-merge-patch/payload/jsonmergepatch/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/payload-json-merge-patch/payload/jsonmergepatch/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/payload-json-merge-patch/payload/jsonmergepatch/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/payload-media-type/payload/mediatype/_serialization.py b/packages/typespec-python/test/unbranded/generated/payload-media-type/payload/mediatype/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/payload-media-type/payload/mediatype/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/payload-media-type/payload/mediatype/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/payload-multipart/payload/multipart/_serialization.py b/packages/typespec-python/test/unbranded/generated/payload-multipart/payload/multipart/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/payload-multipart/payload/multipart/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/payload-multipart/payload/multipart/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/payload-pageable/payload/pageable/_serialization.py b/packages/typespec-python/test/unbranded/generated/payload-pageable/payload/pageable/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/payload-pageable/payload/pageable/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/payload-pageable/payload/pageable/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/payload-xml/payload/xml/_serialization.py b/packages/typespec-python/test/unbranded/generated/payload-xml/payload/xml/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/payload-xml/payload/xml/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/payload-xml/payload/xml/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/routes/routes/_serialization.py b/packages/typespec-python/test/unbranded/generated/routes/routes/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/routes/routes/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/routes/routes/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/serialization-encoded-name-json/serialization/encodedname/json/_serialization.py b/packages/typespec-python/test/unbranded/generated/serialization-encoded-name-json/serialization/encodedname/json/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/serialization-encoded-name-json/serialization/encodedname/json/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/serialization-encoded-name-json/serialization/encodedname/json/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/server-endpoint-not-defined/server/endpoint/notdefined/_serialization.py b/packages/typespec-python/test/unbranded/generated/server-endpoint-not-defined/server/endpoint/notdefined/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/server-endpoint-not-defined/server/endpoint/notdefined/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/server-endpoint-not-defined/server/endpoint/notdefined/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/server-path-multiple/server/path/multiple/_serialization.py b/packages/typespec-python/test/unbranded/generated/server-path-multiple/server/path/multiple/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/server-path-multiple/server/path/multiple/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/server-path-multiple/server/path/multiple/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/server-path-single/server/path/single/_serialization.py b/packages/typespec-python/test/unbranded/generated/server-path-single/server/path/single/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/server-path-single/server/path/single/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/server-path-single/server/path/single/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/server-versions-not-versioned/server/versions/notversioned/_serialization.py b/packages/typespec-python/test/unbranded/generated/server-versions-not-versioned/server/versions/notversioned/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/server-versions-not-versioned/server/versions/notversioned/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/server-versions-not-versioned/server/versions/notversioned/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/server-versions-versioned/server/versions/versioned/_serialization.py b/packages/typespec-python/test/unbranded/generated/server-versions-versioned/server/versions/versioned/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/server-versions-versioned/server/versions/versioned/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/server-versions-versioned/server/versions/versioned/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/special-headers-conditional-request/specialheaders/conditionalrequest/_serialization.py b/packages/typespec-python/test/unbranded/generated/special-headers-conditional-request/specialheaders/conditionalrequest/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/special-headers-conditional-request/specialheaders/conditionalrequest/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/special-headers-conditional-request/specialheaders/conditionalrequest/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/special-headers-repeatability/specialheaders/repeatability/_serialization.py b/packages/typespec-python/test/unbranded/generated/special-headers-repeatability/specialheaders/repeatability/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/special-headers-repeatability/specialheaders/repeatability/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/special-headers-repeatability/specialheaders/repeatability/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/special-words/specialwords/_serialization.py b/packages/typespec-python/test/unbranded/generated/special-words/specialwords/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/special-words/specialwords/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/special-words/specialwords/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-array/typetest/array/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-array/typetest/array/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-array/typetest/array/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-array/typetest/array/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-dictionary/typetest/dictionary/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-dictionary/typetest/dictionary/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-dictionary/typetest/dictionary/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-dictionary/typetest/dictionary/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-enum-extensible/typetest/enum/extensible/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-enum-extensible/typetest/enum/extensible/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-enum-extensible/typetest/enum/extensible/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-enum-extensible/typetest/enum/extensible/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-enum-fixed/typetest/enum/fixed/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-enum-fixed/typetest/enum/fixed/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-enum-fixed/typetest/enum/fixed/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-enum-fixed/typetest/enum/fixed/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-model-empty/typetest/model/empty/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-model-empty/typetest/model/empty/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-model-empty/typetest/model/empty/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-model-empty/typetest/model/empty/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-model-enumdiscriminator/typetest/model/enumdiscriminator/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-model-enumdiscriminator/typetest/model/enumdiscriminator/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-model-enumdiscriminator/typetest/model/enumdiscriminator/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-model-enumdiscriminator/typetest/model/enumdiscriminator/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-model-nesteddiscriminator/typetest/model/nesteddiscriminator/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-model-nesteddiscriminator/typetest/model/nesteddiscriminator/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-model-nesteddiscriminator/typetest/model/nesteddiscriminator/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-model-nesteddiscriminator/typetest/model/nesteddiscriminator/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-model-notdiscriminated/typetest/model/notdiscriminated/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-model-notdiscriminated/typetest/model/notdiscriminated/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-model-notdiscriminated/typetest/model/notdiscriminated/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-model-notdiscriminated/typetest/model/notdiscriminated/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-model-recursive/typetest/model/recursive/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-model-recursive/typetest/model/recursive/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-model-recursive/typetest/model/recursive/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-model-recursive/typetest/model/recursive/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-model-singlediscriminator/typetest/model/singlediscriminator/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-model-singlediscriminator/typetest/model/singlediscriminator/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-model-singlediscriminator/typetest/model/singlediscriminator/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-model-singlediscriminator/typetest/model/singlediscriminator/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-model-usage/typetest/model/usage/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-model-usage/typetest/model/usage/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-model-usage/typetest/model/usage/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-model-usage/typetest/model/usage/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-model-visibility/typetest/model/visibility/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-model-visibility/typetest/model/visibility/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-model-visibility/typetest/model/visibility/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-model-visibility/typetest/model/visibility/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-property-additionalproperties/typetest/property/additionalproperties/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-property-additionalproperties/typetest/property/additionalproperties/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-property-additionalproperties/typetest/property/additionalproperties/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-property-additionalproperties/typetest/property/additionalproperties/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-property-nullable/typetest/property/nullable/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-property-nullable/typetest/property/nullable/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-property-nullable/typetest/property/nullable/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-property-nullable/typetest/property/nullable/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-property-optional/typetest/property/optional/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-property-optional/typetest/property/optional/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-property-optional/typetest/property/optional/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-property-optional/typetest/property/optional/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-property-valuetypes/typetest/property/valuetypes/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-property-valuetypes/typetest/property/valuetypes/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-property-valuetypes/typetest/property/valuetypes/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-property-valuetypes/typetest/property/valuetypes/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-scalar/typetest/scalar/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-scalar/typetest/scalar/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-scalar/typetest/scalar/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-scalar/typetest/scalar/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/typetest-union/typetest/union/_serialization.py b/packages/typespec-python/test/unbranded/generated/typetest-union/typetest/union/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/typetest-union/typetest/union/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/typetest-union/typetest/union/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/versioning-added/versioning/added/_serialization.py b/packages/typespec-python/test/unbranded/generated/versioning-added/versioning/added/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/versioning-added/versioning/added/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/versioning-added/versioning/added/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/versioning-madeoptional/versioning/madeoptional/_serialization.py b/packages/typespec-python/test/unbranded/generated/versioning-madeoptional/versioning/madeoptional/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/versioning-madeoptional/versioning/madeoptional/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/versioning-madeoptional/versioning/madeoptional/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/versioning-removed/versioning/removed/_serialization.py b/packages/typespec-python/test/unbranded/generated/versioning-removed/versioning/removed/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/versioning-removed/versioning/removed/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/versioning-removed/versioning/removed/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/versioning-renamedfrom/versioning/renamedfrom/_serialization.py b/packages/typespec-python/test/unbranded/generated/versioning-renamedfrom/versioning/renamedfrom/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/versioning-renamedfrom/versioning/renamedfrom/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/versioning-renamedfrom/versioning/renamedfrom/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/versioning-returntypechangedfrom/versioning/returntypechangedfrom/_serialization.py b/packages/typespec-python/test/unbranded/generated/versioning-returntypechangedfrom/versioning/returntypechangedfrom/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/versioning-returntypechangedfrom/versioning/returntypechangedfrom/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/versioning-returntypechangedfrom/versioning/returntypechangedfrom/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/packages/typespec-python/test/unbranded/generated/versioning-typechangedfrom/versioning/typechangedfrom/_serialization.py b/packages/typespec-python/test/unbranded/generated/versioning-typechangedfrom/versioning/typechangedfrom/_serialization.py
index 3b56a8b5869..6f299a733ce 100644
--- a/packages/typespec-python/test/unbranded/generated/versioning-typechangedfrom/versioning/typechangedfrom/_serialization.py
+++ b/packages/typespec-python/test/unbranded/generated/versioning-typechangedfrom/versioning/typechangedfrom/_serialization.py
@@ -185,73 +185,7 @@ def deserialize_from_http_generics(cls, body_bytes: Optional[Union[AnyStr, IO]],
 except NameError:
     _long_type = int
 
-
-class UTC(datetime.tzinfo):
-    """Time Zone info for handling UTC"""
-
-    def utcoffset(self, dt):
-        """UTF offset for UTC is 0.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The offset
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(0)
-
-    def tzname(self, dt):
-        """Timestamp representation.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The timestamp representation
-        :rtype: str
-        """
-        return "Z"
-
-    def dst(self, dt):
-        """No daylight saving for UTC.
-
-        :param datetime.datetime dt: The datetime
-        :returns: The daylight saving time
-        :rtype: datetime.timedelta
-        """
-        return datetime.timedelta(hours=1)
-
-
-try:
-    from datetime import timezone as _FixedOffset  # type: ignore
-except ImportError:  # Python 2.7
-
-    class _FixedOffset(datetime.tzinfo):  # type: ignore
-        """Fixed offset in minutes east from UTC.
-        Copy/pasted from Python doc
-        :param datetime.timedelta offset: offset in timedelta format
-        """
-
-        def __init__(self, offset) -> None:
-            self.__offset = offset
-
-        def utcoffset(self, dt):
-            return self.__offset
-
-        def tzname(self, dt):
-            return str(self.__offset.total_seconds() / 3600)
-
-        def __repr__(self):
-            return "<FixedOffset {}>".format(self.tzname(None))
-
-        def dst(self, dt):
-            return datetime.timedelta(0)
-
-        def __getinitargs__(self):
-            return (self.__offset,)
-
-
-try:
-    from datetime import timezone
-
-    TZ_UTC = timezone.utc
-except ImportError:
-    TZ_UTC = UTC()  # type: ignore
+TZ_UTC = datetime.timezone.utc
 
 _FLATTEN = re.compile(r"(?<!\\)\.")
 
@@ -2051,7 +1985,7 @@ def deserialize_rfc(attr):
         try:
             parsed_date = email.utils.parsedate_tz(attr)  # type: ignore
             date_obj = datetime.datetime(
-                *parsed_date[:6], tzinfo=_FixedOffset(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
+                *parsed_date[:6], tzinfo=datetime.timezone(datetime.timedelta(minutes=(parsed_date[9] or 0) / 60))
             )
             if not date_obj.tzinfo:
                 date_obj = date_obj.astimezone(tz=TZ_UTC)
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index e9c3d7eb1e7..20ca18baf16 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -54,8 +54,8 @@ importers:
         specifier: ~1.0.2
         version: 1.0.2
       '@typespec/http-client-python':
-        specifier: ~0.6.2
-        version: 0.6.2(qlnncdzlvp4megu6e6j34u5d6q)
+        specifier: https://artprodcus3.artifacts.visualstudio.com/A0fb41ef4-5012-48a9-bf39-4ee3de03ee35/29ec6040-b234-4e31-b139-33dc4287b756/_apis/artifact/cGlwZWxpbmVhcnRpZmFjdDovL2F6dXJlLXNkay9wcm9qZWN0SWQvMjllYzYwNDAtYjIzNC00ZTMxLWIxMzktMzNkYzQyODdiNzU2L2J1aWxkSWQvNDQ3NjI5MC9hcnRpZmFjdE5hbWUvYnVpbGRfYXJ0aWZhY3RzX3B5dGhvbg2/content?format=file&subPath=%2Fpackages%2Ftypespec-http-client-python-0.6.3.tgz
+        version: https://artprodcus3.artifacts.visualstudio.com/A0fb41ef4-5012-48a9-bf39-4ee3de03ee35/29ec6040-b234-4e31-b139-33dc4287b756/_apis/artifact/cGlwZWxpbmVhcnRpZmFjdDovL2F6dXJlLXNkay9wcm9qZWN0SWQvMjllYzYwNDAtYjIzNC00ZTMxLWIxMzktMzNkYzQyODdiNzU2L2J1aWxkSWQvNDQ3NjI5MC9hcnRpZmFjdE5hbWUvYnVpbGRfYXJ0aWZhY3RzX3B5dGhvbg2/content?format=file&subPath=%2Fpackages%2Ftypespec-http-client-python-0.6.3.tgz(qlnncdzlvp4megu6e6j34u5d6q)
       fs-extra:
         specifier: ~11.2.0
         version: 11.2.0
@@ -76,8 +76,8 @@ importers:
   packages/typespec-python:
     dependencies:
       '@typespec/http-client-python':
-        specifier: ~0.6.2
-        version: 0.6.2(qlnncdzlvp4megu6e6j34u5d6q)
+        specifier: https://artprodcus3.artifacts.visualstudio.com/A0fb41ef4-5012-48a9-bf39-4ee3de03ee35/29ec6040-b234-4e31-b139-33dc4287b756/_apis/artifact/cGlwZWxpbmVhcnRpZmFjdDovL2F6dXJlLXNkay9wcm9qZWN0SWQvMjllYzYwNDAtYjIzNC00ZTMxLWIxMzktMzNkYzQyODdiNzU2L2J1aWxkSWQvNDQ3NjI5MC9hcnRpZmFjdE5hbWUvYnVpbGRfYXJ0aWZhY3RzX3B5dGhvbg2/content?format=file&subPath=%2Fpackages%2Ftypespec-http-client-python-0.6.3.tgz
+        version: https://artprodcus3.artifacts.visualstudio.com/A0fb41ef4-5012-48a9-bf39-4ee3de03ee35/29ec6040-b234-4e31-b139-33dc4287b756/_apis/artifact/cGlwZWxpbmVhcnRpZmFjdDovL2F6dXJlLXNkay9wcm9qZWN0SWQvMjllYzYwNDAtYjIzNC00ZTMxLWIxMzktMzNkYzQyODdiNzU2L2J1aWxkSWQvNDQ3NjI5MC9hcnRpZmFjdE5hbWUvYnVpbGRfYXJ0aWZhY3RzX3B5dGhvbg2/content?format=file&subPath=%2Fpackages%2Ftypespec-http-client-python-0.6.3.tgz(qlnncdzlvp4megu6e6j34u5d6q)
       fs-extra:
         specifier: ~11.2.0
         version: 11.2.0
@@ -1202,8 +1202,9 @@ packages:
     engines: {node: '>=18.0.0'}
     hasBin: true
 
-  '@typespec/http-client-python@0.6.2':
-    resolution: {integrity: sha512-4o8QrNM0EnHLNzf9PuAFhTaX9O3W5hCZo1zJBHkcPfayqyq4amPkfOqOKzfadNJ+BW5c7s/X/m0yLse5CNTVzw==}
+  '@typespec/http-client-python@https://artprodcus3.artifacts.visualstudio.com/A0fb41ef4-5012-48a9-bf39-4ee3de03ee35/29ec6040-b234-4e31-b139-33dc4287b756/_apis/artifact/cGlwZWxpbmVhcnRpZmFjdDovL2F6dXJlLXNkay9wcm9qZWN0SWQvMjllYzYwNDAtYjIzNC00ZTMxLWIxMzktMzNkYzQyODdiNzU2L2J1aWxkSWQvNDQ3NjI5MC9hcnRpZmFjdE5hbWUvYnVpbGRfYXJ0aWZhY3RzX3B5dGhvbg2/content?format=file&subPath=%2Fpackages%2Ftypespec-http-client-python-0.6.3.tgz':
+    resolution: {tarball: https://artprodcus3.artifacts.visualstudio.com/A0fb41ef4-5012-48a9-bf39-4ee3de03ee35/29ec6040-b234-4e31-b139-33dc4287b756/_apis/artifact/cGlwZWxpbmVhcnRpZmFjdDovL2F6dXJlLXNkay9wcm9qZWN0SWQvMjllYzYwNDAtYjIzNC00ZTMxLWIxMzktMzNkYzQyODdiNzU2L2J1aWxkSWQvNDQ3NjI5MC9hcnRpZmFjdE5hbWUvYnVpbGRfYXJ0aWZhY3RzX3B5dGhvbg2/content?format=file&subPath=%2Fpackages%2Ftypespec-http-client-python-0.6.3.tgz}
+    version: 0.6.3
     engines: {node: '>=18.0.0'}
     peerDependencies:
       '@azure-tools/typespec-autorest': '>=0.49.0 <1.0.0'
@@ -4868,7 +4869,7 @@ snapshots:
       yaml: 2.5.1
       yargs: 17.7.2
 
-  '@typespec/http-client-python@0.6.2(qlnncdzlvp4megu6e6j34u5d6q)':
+  '@typespec/http-client-python@https://artprodcus3.artifacts.visualstudio.com/A0fb41ef4-5012-48a9-bf39-4ee3de03ee35/29ec6040-b234-4e31-b139-33dc4287b756/_apis/artifact/cGlwZWxpbmVhcnRpZmFjdDovL2F6dXJlLXNkay9wcm9qZWN0SWQvMjllYzYwNDAtYjIzNC00ZTMxLWIxMzktMzNkYzQyODdiNzU2L2J1aWxkSWQvNDQ3NjI5MC9hcnRpZmFjdE5hbWUvYnVpbGRfYXJ0aWZhY3RzX3B5dGhvbg2/content?format=file&subPath=%2Fpackages%2Ftypespec-http-client-python-0.6.3.tgz(qlnncdzlvp4megu6e6j34u5d6q)':
     dependencies:
       '@azure-tools/typespec-autorest': 0.49.0(nwofiqdfkiaeq4xrrk3jkqf6au)
       '@azure-tools/typespec-azure-core': 0.49.0(@typespec/compiler@0.63.0)(@typespec/http@0.63.0(@typespec/compiler@0.63.0))(@typespec/rest@0.63.0(@typespec/compiler@0.63.0)(@typespec/http@0.63.0(@typespec/compiler@0.63.0)))