Python datetime object show wrong timezone offset

问题

I am try creating a datetime object in python using datetime and pytz, the offset shown is wrong.

import datetime
from pytz import timezone

start = datetime.datetime(2011, 6, 20, 0, 0, 0, 0, timezone(\'Asia/Kolkata\'))
print start

The output shown is

datetime.datetime(2011, 6, 20, 0, 0, tzinfo=<DstTzInfo \'Asia/Kolkata\' HMT+5:53:00 STD>)

Note that \'Asia/Kolkata\' is IST which is GMT+5:30 and not HMT+5:53. This is a standard linux timezone, why do I get this wrong, and how do I solve it?

回答1:

See: http://bytes.com/topic/python/answers/676275-pytz-giving-incorrect-offset-timezone

In the comments, someone proposes to use tzinfo.localize() instead of the datetime constructor, which does the trick.

>>> tz = timezone('Asia/Kolkata')
>>> dt = tz.localize(datetime.datetime(2011, 6, 20, 0, 0, 0, 0))
>>> dt
datetime.datetime(2011, 6, 20, 0, 0, tzinfo=<DstTzInfo 'Asia/Kolkata' IST+5:30:00 STD>)

UPDATE: Actually, the official pytz website states that you should always use localize or astimezone instead of passing a timezone object to datetime.datetime.

来源：https://stackoverflow.com/questions/6410971/python-datetime-object-show-wrong-timezone-offset