Checking if date is in UTC format

问题

Im using the pytz module to translate a date in America/Los_Angeles timezone to utc by the code below :

TZ = 'America/Los_Angeles'
from = pytz.timezone(TZ)
utc = from.localize(original_date).astimezone(pytz.utc)

Now,i want to test if utc value is actually in UTC format or not. How to do that with pytz or datetime ?

Please Help Thank You

回答1:

utc.tzinfo == pytz.utc # returns True if utc in UTC

Example:

now = datetime.datetime.now(pytz.utc)
now.tzinfo == pytz.utc # returns True

now = now.astimezone(pytz.timezone('America/Los_Angeles'))
now.tzinfo == pytz.utc # returns False

回答2:

The accepted answer will not work for anything else as pytz objects. As pytz is actually pretty bad at doing conversions[1] (e.g. properly doing daylight savings etc) it is probably better to do a cross-implementation check.

now = datetime.datetime.now(pytz.utc)
if now.tzinfo:
    now.utcoffset().total_seconds() == 0 # returns true

[1] https://pendulum.eustace.io/blog/a-faster-alternative-to-pyz.html

来源：https://stackoverflow.com/questions/6706499/checking-if-date-is-in-utc-format