使用 pytz 进行日期时间和时区转换 - 令人兴奋的行为 [英] datetime and timezone conversion with pytz - mind blowing behaviour

问题描述

我正在尝试将时区感知 datetime 对象转换为 UTC，然后再转换回原来的时区.我有以下片段

I'm trying to convert timezone aware datetime object to UTC and then back to it's original timezone. I have a following snippet

t = datetime(
    2013, 11, 22, hour=11, minute=0,
    tzinfo=pytz.timezone('Europe/Warsaw')
)

现在在 ipython 中:

now in ipython:

In [18]: t
Out[18]: datetime.datetime(
    2013, 11, 22, 11, 0, tzinfo=<DstTzInfo 'Europe/Warsaw' WMT+1:24:00 STD>
)

现在让我们尝试转换为 UTC 并返回.我希望具有与以下相同的表示:

and now let's try to do conversion to UTC and back. I would expect to have the same representation as:

In [19]: t.astimezone(pytz.utc).astimezone(pytz.timezone('Europe/Warsaw'))
Out[19]: datetime.datetime(
    2013, 11, 22, 10, 36, tzinfo=<DstTzInfo 'Europe/Warsaw' CET+1:00:00 STD>
)

然而我们看到 Out[18] 和 Out[19] 不同.怎么回事?

Yet we see that Out[18] and Out[19] differ. What's going on?

推荐答案

文档 http://pytz.sourceforge.net/ 声明不幸的是，对于许多时区，使用标准日期时间构造函数的 tzinfo 参数对 pytz '不起作用'."代码:

The documentation http://pytz.sourceforge.net/ states "Unfortunately using the tzinfo argument of the standard datetime constructors 'does not work' with pytz for many timezones." The code:

t = datetime(
    2013, 5, 11, hour=11, minute=0,
    tzinfo=pytz.timezone('Europe/Warsaw')
)

按照这个不行，你应该使用localize方法:

doesn't work according to this, instead you should use the localize method:

t = pytz.timezone('Europe/Warsaw').localize(
        datetime(2013, 5, 11, hour=11, minute=0))

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