正如 @TimPietzcker 所建议的, dateutil 包是正确的选择,它可以正确且自动地处理前 3 种格式:
>>> from dateutil.parser import parse
>>> parse("Fri Sep 25 18:09:49 -0500 2009")
datetime.datetime(2009, 9, 25, 18, 9, 49, tzinfo=tzoffset(None, -18000))
>>> parse("2008-06-29T00:42:18.000Z")
datetime.datetime(2008, 6, 29, 0, 42, 18, tzinfo=tzutc())
>>> parse("2011-07-16T21:46:39Z")
datetime.datetime(2011, 7, 16, 21, 46, 39, tzinfo=tzutc())
unixtime 格式似乎有点打嗝,但幸运的是标准datetime.datetime
已准备好执行任务:
>>> from datetime import datetime
>>> datetime.utcfromtimestamp(float("1294989360"))
datetime.datetime(2011, 1, 14, 7, 16)
从中创建一个处理所有 4 种格式的函数相当容易:
from dateutil.parser import parse
from datetime import datetime
def parse_time(s):
try:
ret = parse(s)
except ValueError:
ret = datetime.utcfromtimestamp(s)
return ret