PYTZ正确抵消了日光的时区

Question

我的功能可以返回城市 他们的UTC Offsets

NOW = datetime.datetime.utcnow()
ZERO = datetime.timedelta(0)
result_list = {}
allowed_city = ['Europe/London', 'Europe/Amsterdam', 'Europe/Helsinki', 'Europe/Moscow', 
'Asia/Yekaterinburg', 'Asia/Novosibirsk', 'Asia/Shanghai', 'Asia/Tokyo']
for tname in allowed_city:
    tzone = pytz.timezone(tname)
    std_date = None
    try:
        for utcdate, info in zip(
                tzone._utc_transition_times, tzone._transition_info):
            utcoffset, dstoffset, tzname = info
            if dstoffset == ZERO:
                std_date = utcdate
            if utcdate > NOW:
                break
    except AttributeError:
        std_date = NOW
    std_date = tzone.localize(std_date)
    key = std_date.strftime('%z')
    result_list[tname] = "%s UTC %s" % (key, tname)

并由偏移订购：

collections.OrderedDict(sorted(result_list.items(), key=lambda x: x[1]))

获取下一个列表：

+0000 UTC Europe/London
+0200 UTC Europe/Amsterdam
...
+0900 UTC Asia/Shanghai
+1000 UTC Asia/Tokyo

，例如上海是UTC/GMT 8小时。是日光的东西还是问题在哪里？如何根据日光返回正确的时区列表？

Answer 1

除非tzone是UTC，否则将UTC时间传递给tzone.localize()是不正确的。改用tzone.fromutc(std_date)。