我正在尝试在 Python 中生成 RFC 3339 UTC 时间戳.到目前为止,我已经能够做到以下几点:
>>>d = 日期时间.日期时间.现在()>>>打印 d.isoformat('T')2011-12-18T20:46:00.392227我的问题是设置 UTC 偏移量.
根据docs,classmethod datetime.now([tz]),采用可选的 tz 参数,其中 tz 必须是类 tzinfo 子类 和 datetime.tzinfo 的实例是时区信息对象的抽象基类.
这就是我迷路的地方 - 为什么 tzinfo 是一个抽象类,我应该如何实现它?
(注意:在 PHP 中它就像 timestamp = date(DATE_RFC3339); 一样简单,这就是为什么我不明白为什么 Python 的方法如此复杂...)
解决方案UPDATE 2021
在 Python 3.2 中 timezone 被添加到 datetime 模块中,允许您轻松地为 UTC 分配时区.
>>>导入日期时间>>>n = datetime.datetime.now(datetime.timezone.utc)>>>n.isoformat()'2021-07-13T15:28:51.818095+00:00'上一个答案:
时区很痛苦,这可能是他们选择不将它们包含在日期时间库中的原因.
试试 pytz,它有你要找的 tzinfo:pytz.sourceforge/
您需要首先创建 datetime 对象,然后应用如下所示的时区,然后您的 .isoformat() 输出将根据需要包含 UTC 偏移量:
d = datetime.datetime.utcnow()d_with_timezone = d.replace(tzinfo=pytz.UTC)d_with_timezone.isoformat()'2017-04-13T14:34:23.111142+00:00'
或者,只使用 UTC,然后抛出一个Z";(对于 Zulu 时区)在末尾标记时区"作为 UTC.
d = datetime.datetime.utcnow() # <-- 获取UTC时间打印 d.isoformat("T") + "Z";'2017-04-13T14:34:23.111142Z'
I'm trying to generate an RFC 3339 UTC timestamp in Python. So far I've been able to do the following:
>>> d = datetime.datetime.now() >>> print d.isoformat('T') 2011-12-18T20:46:00.392227My problem is with setting the UTC offset.
According to the docs, the classmethod datetime.now([tz]), takes an optional tz argument where tz must be an instance of a class tzinfo subclass, and datetime.tzinfo is an abstract base class for time zone information objects.
This is where I get lost- How come tzinfo is an abstract class, and how am I supposed to implement it?
(NOTE: In PHP it's as simple as timestamp = date(DATE_RFC3339);, which is why I can't understand why Python's approach is so convoluted...)
解决方案UPDATE 2021
In Python 3.2 timezone was added to the datetime module allowing you to easily assign a timezone to UTC.
>>> import datetime >>> n = datetime.datetime.now(datetime.timezone.utc) >>> n.isoformat() '2021-07-13T15:28:51.818095+00:00'previous answer:
Timezones are a pain, which is probably why they chose not to include them in the datetime library.
try pytz, it has the tzinfo your looking for: pytz.sourceforge/
You need to first create the datetime object, then apply the timezone like as below, and then your .isoformat() output will include the UTC offset as desired:
d = datetime.datetime.utcnow() d_with_timezone = d.replace(tzinfo=pytz.UTC) d_with_timezone.isoformat()
'2017-04-13T14:34:23.111142+00:00'
Or, just use UTC, and throw a "Z" (for Zulu timezone) on the end to mark the "timezone" as UTC.
d = datetime.datetime.utcnow() # <-- get time in UTC print d.isoformat("T") + "Z"
'2017-04-13T14:34:23.111142Z'
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