使用strptime将带偏移量的时间戳转换为datetime obj [英] Convert timestamps with offset to datetime obj using strptime

问题描述

我正在使用strptime方法将格式2012-07-24T23：14：29-07：00
的时间戳转换为python中的datetime对象。问题在于结束时的时间偏移（-07：00）。没有偏移我可以成功地执行

I am trying to convert time-stamps of the format "2012-07-24T23:14:29-07:00" to datetime objects in python using strptime method. The problem is with the time offset at the end(-07:00). Without the offset i can successfully do

time_str = "2012-07-24T23:14:29"

time_obj=datetime.datetime.strptime(time_str,'%Y-%m-%dT%H:%M:%S')

但是，我尝试使用偏移量

But with the offset i tried

time_str = "2012-07-24T23:14:29-07:00"

time_obj=datetime.datetime.strptime(time_str,'%Y-%m-%dT%H:%M:%S-%z').

但是它给出了一个值错误，说z是一个坏的指令。

But it gives a Value error saying "z" is a bad directive.

任何想法的工作？

推荐答案

Python 2 strptime（）函数确实不支持时区的％z 格式（因为底层的 time.strptime（）功能不支持它）。您有两个选项：

The Python 2 strptime() function indeed does not support the %z format for timezones (because the underlying time.strptime() function doesn't support it). You have two options:

• 使用 strptime解析时忽略时区 ：

time_obj = datetime.datetime.strptime(time_str[:19], '%Y-%m-%dT%H:%M:%S')

使用 dateutil 模块，它的解析功能 处理时区：

from dateutil.parser import parse
time_obj = parse(time_str)

在命令提示符下快速演示：

Quick demo on the command prompt:

>>> from dateutil.parser import parse
>>> parse("2012-07-24T23:14:29-07:00")
datetime.datetime(2012, 7, 24, 23, 14, 29, tzinfo=tzoffset(None, -25200))

您还可以升级到Python 3.2或更新版本，时区支持已经改进为％z 将工作，只要您从输入中删除最后一个：， - 从％z 之前：

You could also upgrade to Python 3.2 or newer, where timezone support has been improved to the point that %z would work, provided you remove the last : from the input, and the - from before the %z:

>>> import datetime
>>> time_str = "2012-07-24T23:14:29-07:00"
>>> datetime.datetime.strptime(time_str, '%Y-%m-%dT%H:%M:%S%z')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/mj/Development/Library/buildout.python/parts/opt/lib/python3.4/_strptime.py", line 500, in _strptime_datetime
    tt, fraction = _strptime(data_string, format)
  File "/Users/mj/Development/Library/buildout.python/parts/opt/lib/python3.4/_strptime.py", line 337, in _strptime
    (data_string, format))
ValueError: time data '2012-07-24T23:14:29-07:00' does not match format '%Y-%m-%dT%H:%M:%S%z'
>>> ''.join(time_str.rsplit(':', 1))
'2012-07-24T23:14:29-0700'
>>> datetime.datetime.strptime(''.join(time_str.rsplit(':', 1)), '%Y-%m-%dT%H:%M:%S%z')
datetime.datetime(2012, 7, 24, 23, 14, 29, tzinfo=datetime.timezone(datetime.timedelta(-1, 61200)))

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