如何确定DST何时在Python中的特定位置开始或结束？

问题描述

我正在寻找一种确定我正在研究的Python脚本中DST何时开始或结束给定时区的方法。

I'm looking for a method of determining when DST starts or ends for a given timezone in a Python script I'm working on.

我知道可以将我正在工作的UTC日期转换为本地时间，并将考虑DST，但是对于此特定应用程序，我需要知道这一点转换。

I know pytz can convert the UTC dates I'm working into localtime, and will take DST into account, however for this particular application I need to know the point of the changeover.

有什么建议吗？

推荐答案

您可以看看 _utc_transition_times 您正在使用的时区的成员。

You could have a look to the _utc_transition_times memberof the timezone you're using.

>>> from pytz import timezone
>>> tz = timezone("Europe/Paris")
>>> print tz._utc_transition_times

[datetime.datetime(1, 1, 1, 0, 0), datetime.datetime(1911, 3, 10, 23, 51, 39), datetime.datetime(1916, 6, 14, 23, 0), datetime.datetime(1916, 10, 1, 23, 0), date
....
 datetime.datetime(2037, 3, 29, 1, 0), datetime.datetime(2037, 10, 25, 1, 0)]

您是DST更改日期（DST的开始和结束）的列表。

It will give you the list of the DST change dates (start and end of DST).

根据tzinfo.py的代码

According to the code of tzinfo.py

class DstTzInfo(BaseTzInfo):
    '''A timezone that has a variable offset from UTC

    The offset might change if daylight savings time comes into effect,
    or at a point in history when the region decides to change their
    timezone definition.
    '''
    # Overridden in subclass
    _utc_transition_times = None # Sorted list of DST transition times in UTC
    _transition_info = None # [(utcoffset, dstoffset, tzname)] corresponding
                            # to _utc_transition_times entries

因此，如果您混合使用 _utc_transition_times 和 _transition_info ，您将获取所有需要的信息，日期，时间和偏移量；;

So if you mix the _utc_transition_times with _transition_info you will grab all your needed informations, date, time and offset to apply ;)

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