问题
Possible Duplicate:
Python datetime object show wrong timezone offset
import pytz, datetime
pytz.timezone("Asia/Calcutta")
prints the following:
< DstTzInfo 'Asia/Calcutta' HMT+5:53:00 STD >
Why it is not 05:30 hrs? I am in timezone America/Los_Angeles.
回答1:
Time zones change over the years. According to http://www.prokerala.com/travel/timezones/Asia/Kolkata?mode=history the original offset for that zone was 5.88888888889 hours, or 5 hours 53 minutes. pytz will use the proper offset and nomenclature once you assign the zone to an actual date.
>>> tz = pytz.timezone("Asia/Calcutta")
>>> tz
<DstTzInfo 'Asia/Calcutta' HMT+5:53:00 STD>
>>> tz.localize(datetime.datetime(1901, 7, 10, 12, 0))
datetime.datetime(1901, 7, 10, 12, 0, tzinfo=<DstTzInfo 'Asia/Calcutta' HMT+5:53:00 STD>)
>>> tz.localize(datetime.datetime(2012, 7, 10, 12, 0))
datetime.datetime(2012, 7, 10, 12, 0, tzinfo=<DstTzInfo 'Asia/Calcutta' IST+5:30:00 STD>)
来源：https://stackoverflow.com/questions/11442183/pytz-timezone-shows-weird-results-for-asia-calcutta