Why Does pytz Show an Unconventional Time Zone Offset for 'Asia/Hong_Kong'?

Unconventional Time Zone Offset in pytz

In pytz, creating a time zone object using the 'Asia/Hong_Kong' time zone name seems unusual, as it returns a seven-hour and 37-minute offset. This behavior is not unique.

The cause lies in the fact that time zones and offsets undergo historical changes. Pytz initializes time zone objects with the earliest available name and offset for a given zone. Hence, the default offset may appear odd at times.

To resolve this issue, use the localize() method instead of the datetime constructor when attaching the time zone to a date. This method incorporates the correct zone name and offset at that specific time.

For example:

>>> import pytz
>>> from datetime import datetime
>>> hk = pytz.timezone('Asia/Hong_Kong')

>>> dt1 = datetime(2012,1,1,tzinfo=hk)
>>> dt2 = hk.localize(datetime(2012,1,1))

>>> dt1 > dt2
False

Using localize() ensures proper adjustment of the time zone name and offset.

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