使用 pytz 进行日期时间和时区转换 - 令人兴奋的行为
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?
解决方案
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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