Python strptime（）和时区？ [英] Python strptime() and timezones?

问题描述

我有一个来自Blackberry IPD备份的CSV转储文件，使用IPDDump创建。
这里的日期/时间字符串看起来像这样
（其中 EST 是澳大利亚时区）：

  Tue Jun 22 07:46:22 EST 2010 
  

我需要能够在Python中解析这个日期。起初，我试图使用datettime中的 strptime（）函数。

 >>> datetime.datetime.strptime（'Tue Jun 22 12:10:20 2010 EST'，'％a％b％d％H：％M：％S％Y％Z'）
  

但是，由于某些原因，返回的 datetime 对象似乎没有任何 tzinfo 与之相关。

我在这个页面，显然 datetime.strptime 默认丢弃 tzinfo ，但是，我检查了文档，我找不到任何这样的记录这里。

我已经能够使用第三方Python库解析日期， dateutil ，但是我仍然很好奇我如何使用内置的 strptime（）不正确？有没有办法得到 strptime（）可以很好地使用时区？

解决方案

datetime 模块文档说：

返回对应于date_string的datetime，根据格式进行解析。这相当于 datetime（*（time.strptime（date_string，format）[0：6]））。

看到 [0：6] ？这让你（年，月，日，小时，分，秒）。没有其他的。没有提到时区。

有趣的是，[Win XP SP2，Python 2.6,2.7]将您的示例传递给 time.strptime 不工作，但如果你脱掉％Z和EST，它的工作。也使用UTC或GMT而不是EST作品。 PST和MEZ不起作用困惑。

I have a CSV dumpfile from a Blackberry IPD backup, created using IPDDump. The date/time strings in here look something like this (where EST is an Australian time-zone):

Tue Jun 22 07:46:22 EST 2010

I need to be able to parse this date in Python. At first, I tried to use the strptime() function from datettime.

>>> datetime.datetime.strptime('Tue Jun 22 12:10:20 2010 EST', '%a %b %d %H:%M:%S %Y %Z')

However, for some reason, the datetime object that comes back doesn't seem to have any tzinfo associated with it.

I did read on this page that apparently datetime.strptime silently discards tzinfo, however, I checked the documentation, and I can't find anything to that effect documented here.

I have been able to get the date parsed using a third-party Python library, dateutil, however I'm still curious as to how I was using the in-built strptime() incorrectly? Is there any way to get strptime() to play nicely with timezones?

解决方案

The datetime module documentation says:

Return a datetime corresponding to date_string, parsed according to format. This is equivalent to datetime(*(time.strptime(date_string, format)[0:6])).

See that [0:6]? That gets you (year, month, day, hour, minute, second). Nothing else. No mention of timezones.

Interestingly, [Win XP SP2, Python 2.6, 2.7] passing your example to time.strptime doesn't work but if you strip off the " %Z" and the " EST" it does work. Also using "UTC" or "GMT" instead of "EST" works. "PST" and "MEZ" don't work. Puzzling.

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