问Python夏令时

EN

>>> import time
>>> time.localtime()
(2010, 5, 21, 21, 48, 51, 4, 141, 0)
>>> _.tm_isdst
0

import pytz

from datetime import datetime

def is_dst(dt=None, timezone="UTC"):
    if dt is None:
        dt = datetime.utcnow()
    timezone = pytz.timezone(timezone)
    timezone_aware_date = timezone.localize(dt, is_dst=None)
    return timezone_aware_date.tzinfo._dst.seconds != 0

>>> is_dst() # it is never DST in UTC
False
>>> is_dst(datetime(2019, 1, 1), timezone="US/Pacific")
False
>>> is_dst(datetime(2019, 4, 1), timezone="US/Pacific")
True
>>> is_dst(datetime(2019, 3, 10, 2), timezone="US/Pacific")
NonExistentTimeError
>>> is_dst(datetime(2019, 11, 3, 1), timezone="US/Pacific")
AmbiguousTimeError

import datetime
import pytz

def is_dst(dt,timeZone):
   aware_dt = timeZone.localize(dt)
   return aware_dt.dst() != datetime.timedelta(0,0)

timeZone = pytz.timezone("Europe/London")

dt = datetime.datetime(2019,8,2)
is_dst(dt,timeZone)
True

dt = datetime.datetime(2019,2,2)
is_dst(dt,timeZone)
False