Python中的datetime.fromtimestamp（os.path.getctime（））给我一个时区感知值？ [英] Does datetime.fromtimestamp(os.path.getctime()) in Python give me a timezone-aware value?

问题描述

我在Python 3.4中使用这样的调用：

I am using calls such as this in Python 3.4:

x = datetime.fromtimestamp(os.path.getctime(somefilename))
y = datetime.fromtimestamp(os.path.getmtime(somefilename))

根据 x 和 y 具有时区感知功能。 org / 3.4 / library / datetime.htmlrel =nofollow>在datetime文档中定义该术语？这在平台之间有所不同吗？我认为在理论上，文件的ctime和mtime是从UTC时代以来的秒数来衡量的，所以答案应该是肯定的？

Will x and y be timezone-aware, as per the definition of that term in the datetime documentation? Does this vary between platforms? I assume that in theory the ctime and mtime of a file are measured against the seconds since the epoch in UTC, so the answer should be yes?

如果是，那么所有/大多数POSIX平台都是真的吗？具体来说，在现代Linux / OS X上是否正确？

If so, is that true across all/most POSIX platforms? Specifically, is it true on modern Linux/OS X?

如果没有，是否有更好的处理方法？如何获取时区感知时间和时间数据？平台用于表达/存储ctime和mtime的时区是什么？

If not, is there a better way to handle this? How can I get timezone-aware ctime and mtime data? What timezone do platforms use for expressing/storing ctime and mtime?

推荐答案

在OSX上，至少， os.path.getctime 在系统时区返回TZ-naive datetime。

On OSX, at least, os.path.getctime returns a TZ-naive datetime in the system's timezone.

$ date
Mon Jun  8 15:08:40 PDT 2015

$ touch new_file
$ python  
>>> from datetime import datetime
>>> import os
>>> datetime.fromtimestamp(os.path.getctime('new_file'))
datetime.datetime(2015, 6, 8, 15, 8, 42)
>>> print datetime.fromtimestamp(os.path.getctime('new_file')).tzinfo
None

time.timezone 将为您提供本地时区偏移（以秒为单位），不计入DST 。 pytz 图书馆可能对您非常有用。

time.timezone will give you the local timezone offset in seconds, not accounting for DST. The pytz library will probably be very useful to you.

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