如何在python中确定过去的时区特定日期是否为夏令时？

Question

有没有办法在我指定的日期检查特定时区是否在夏令时？

    test_dt = datetime(year=2015, month=2, day=1)
    pst = pytz.timezone('America/Los_Angeles')
    test_dt = pst.localize(test_dt) 

    # should return False
    is_day_light_saving(test_dt)        

Answer 1

只需调用的datetime.dst()方法:

def is_summer_time(aware_dt):
    assert aware_dt.tzinfo is not None
    assert aware_dt.tzinfo.utcoffset(aware_dt) is not None
    return bool(aware_dt.dst())

例:

#!/usr/bin/env python
from datetime import datetime
import pytz # $ pip install pytz

naive = datetime(2015, 2, 1)
pacific = pytz.timezone('America/Los_Angeles')
aware = pacific.localize(naive, is_dst=None) 

print(is_summer_time(aware))

它相当于:

bool(pytz.timezone('America/Los_Angeles').dst(datetime(2015, 2, 1), is_dst=None))