BUG: Fix to_html adding time to datetime columns in transposed DataFrame (GH#10640) #63400
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Description:
When using
to_htmlon a transposed DataFrame with a DatetimeIndex, the column headers were including the time component (e.g.,00:00:00) even when it should be hidden. This was becauseHTMLFormatterwas using the raw column values instead of the formatted values.Fix:
HTMLFormatter._get_columns_formatted_valuesto useself.columns._format_flat(include_name=False), aligning the behavior withNotebookFormatterand respecting display options.Verification:
test_to_html_datetime_columns_no_timeinpandas/tests/io/formats/test_to_html.py.doc/source/whatsnew/v3.0.0.rst.