如何将包含BST(英国夏令时)的时间戳字符串解析为可识别时区的datetime时间戳?

问题描述

我的时间戳格式为格林威治标准时间25年10月20日1:00:00".和"BST 25-Oct-20 12:00:00 AM"我希望将它们解析为可识别时区的日期时间.我尝试使用strptime格式％d-％b-％y％I:％M:％S％p％Z"

I have timestamps of the format "25-Oct-20 1:00:00 AM GMT" and "25-Oct-20 12:00:00 AM BST" and I wish to parse them into a timezone aware datetime. I have tried using the strptime format "%d-%b-%y %I:%M:%S %p %Z"

然而，datetime.strptime的％Z参数不能将BST识别为有效输入，因此我无法弄清正确"的BST.解析夏令时的方法.

However the %Z argument of datetime.strptime does not recognize BST as a valid input, and I can not figure out the "correct" way to handle parsing daylight savings times.

推荐答案

如果您查看 dateutil 中的错误，则会显示类似以下内容:

If you look at the error from dateutil, it says something like:

UnknownTimezoneWarning: tzname BST identified but not understood.  
Pass `tzinfos` argument in order to correctly return a timezone-aware
datetime.  In a future version, this will raise an exception.

换句话说，您可以传入将时区别名(例如"BST")映射到适当的时区信息的字典.也许像这样:

In other words, you can pass in a dictionary that maps timezone aliases (like "BST") to appropriate timezone information. Maybe something like:

>>> import dateutil.parser
>>> import dateutil.tz
>>> BST = dateutil.tz.gettz('Europe/London')
>>> dateutil.parser.parse('25-Oct-20 12:00:00 AM BST', tzinfos={'BST': BST})
datetime.datetime(2020, 10, 25, 0, 0, tzinfo=tzfile('/usr/share/zoneinfo/Europe/London'))

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