日期时间和时区转换与pytz - 心灵吹拂行为 [英] datetime and timezone conversion with pytz - mind blowing behaviour

问题描述

我正在尝试将时区知道 datetime 对象转换为UTC，然后返回到原始时区。我有以下代码片段

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。我希望具有相同的表示方式：

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 [18] 和 Out [19] 不同。发生了什么？

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

推荐答案

文档 http://pytz.sourceforge.net/ 指出不幸的是，使用标准datetime构造函数的tzinfo参数对于许多时区而言并不适用于pytz。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')
)

根据这个工作，您应该使用本地化方法：

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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