不支持is24hourSource属性。

[dingyuanjie]

原库描述：Change how the 24h mode (am/pm) should be determined, by device settings or by locale. {'locale', 'device'} (android only, default: 'device')

不支持原因：HarmonyOS中TimePicker、TimePickerDialog、DatePickerDialog组件均不支持此属性。