如何将本地时间字符串转换为 UTC? [英] How to convert local time string to UTC?

问题描述

如何将日期时间本地时间字符串转换为UTC时间字符串?

How do I convert a datetime string in local time to a string in UTC time?

我确定我以前做过这个，但找不到它，所以希望将来能帮助我(和其他人)做到这一点.

I'm sure I've done this before, but can't find it and SO will hopefully help me (and others) do that in future.

澄清:例如，如果我在本地时区 (+10) 中有 2008-09-17 14:02:00，我想生成一个具有等效 UTC 时间的字符串:2008-09-17 04:02:00.

Clarification: For example, if I have 2008-09-17 14:02:00 in my local timezone (+10), I'd like to generate a string with the equivalent UTC time: 2008-09-17 04:02:00.

另外，来自 http://lucumr.pocoo.org/2011/7/15/eppur-si-muove/，请注意，通常这是不可能的，因为 DST 和其他问题没有从本地时间到 UTC 时间的唯一转换.

Also, from http://lucumr.pocoo.org/2011/7/15/eppur-si-muove/, note that in general this isn't possible as with DST and other issues there is no unique conversion from local time to UTC time.

推荐答案

感谢@rofly，字符串到字符串的完整转换如下:

Thanks @rofly, the full conversion from string to string is as follows:

time.strftime("%Y-%m-%d %H:%M:%S", 
              time.gmtime(time.mktime(time.strptime("2008-09-17 14:04:00", 
                                                    "%Y-%m-%d %H:%M:%S"))))

我对time/calendar函数的总结:

time.strptime
字符串 --> 元组(没有应用时区，所以匹配字符串)

time.strptime
string --> tuple (no timezone applied, so matches string)

time.mktime
本地时间元组 --> 自纪元以来的秒数(始终为本地时间)

time.mktime
local time tuple --> seconds since epoch (always local time)

time.gmtime
自纪元以来的秒数 --> UTC 中的元组

time.gmtime
seconds since epoch --> tuple in UTC

和

calendar.timegm
UTC 中的元组 --> 自纪元以来的秒数

calendar.timegm
tuple in UTC --> seconds since epoch

time.localtime
自纪元以来的秒数 --> 本地时区中的元组

time.localtime
seconds since epoch --> tuple in local timezone

这篇关于如何将本地时间字符串转换为 UTC?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！