Python UTC datetime对象的ISO格式不包括Z(Zulu或Zero offset) [英] Python UTC datetime object's ISO format dont include Z (Zulu or Zero offset)

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本文介绍了Python UTC datetime对象的ISO格式不包括Z(Zulu或Zero offset)的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

任何人都知道为什么python 2.7在UTC时间对象的isoformat字符串的末尾不包含Z字符(祖鲁或零偏移),不像JavaScript?

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

而在javascript中

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


解决方案

Python datetime 对象默认情况下没有时区信息,没有它,Python实际上违反了ISO 8601规范(如果没有给定时区信息,假定是本地时间)。您可以使用 pytz包获取一些默认时区,或直接子类 tzinfo 你自己:

从$ datetime import datetime,tzinfo,timedelta 
class simple_utc(tzinfo):
def tzname(self):
returnUTC
def utcoffset(self,dt):
return timedelta(0)
/ pre>

然后您可以手动将时区信息添加到 utcnow()

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

请注意,此DOES符合ISO 8601格式,允许 Z +00:00 作为UTC的后缀。请注意,后者实际上更符合标准,通常时区如何表示(UTC是一种特殊情况。)


Anybody knows why python 2.7 don'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'

Whereas in javascript

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

解决方案

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):
        return "UTC"
    def utcoffset(self, dt):
        return timedelta(0)

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'

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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