問題描述

為什么 python 2.7 不像 JavaScript 那樣在 UTC 日期時間對象的 isoformat 字符串的末尾不包含 Z 字符(Zulu 或零偏移)?

Why python 2.7 doesn't include Z character (Zulu or zero offset) at the end of UTC datetime object's isoformat string unlike JavaScript?

>>> datetime.datetime.utcnow().isoformat()
'2013-10-29T09:14:03.895210'

而在 javascript 中

Whereas in javascript

>>>  console.log(new Date().toISOString()); 
2013-10-29T09:38:41.341Z

推薦答案

Python datetime 對象默認沒有時區信息，沒有它，Python 實際上違反了 ISO 8601 規范(如果沒有給出時區信息，則假定為當地時間).您可以使用 pytz 包 來獲取一些默認時區，或者直接子類化 tzinfo 你自己:

Python datetime objects don't have time zone info by default, and without it, Python actually violates the ISO 8601 specification (if no time zone info is given, assumed to be local time). You can use the pytz package to get some default time zones, or directly subclass tzinfo yourself:

from datetime import datetime, tzinfo, timedelta
class simple_utc(tzinfo):
    def tzname(self,**kwargs):
        return "UTC"
    def utcoffset(self, dt):
        return timedelta(0)

然后你可以手動將時區信息添加到utcnow():

Then you can manually add the time zone info to utcnow():

>>> datetime.utcnow().replace(tzinfo=simple_utc()).isoformat()
'2014-05-16T22:51:53.015001+00:00'

請注意，這符合 ISO 8601 格式，該格式允許 Z 或 +00:00 作為 UTC 的后綴.請注意，后者實際上更符合標準，通常表示時區(UTC 是一個特例.)

Note that this DOES conform to the ISO 8601 format, which allows for either Z or +00:00 as the suffix for UTC. Note that the latter actually conforms to the standard better, with how time zones are represented in general (UTC is a special case.)

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