将datetime转换为POSIX时间

Question

如何将日期时间或日期对象转换为python中的POSIX时间戳？有一些方法可以从时间戳中创建一个日期时间对象,但我似乎没有找到任何明显的方法以相反的方式进行操作.

Answer 1

import time, datetime

d = datetime.datetime.now()
print time.mktime(d.timetuple())

Answer 2

对于UTC计算,calendar.timegm是逆的time.gmtime.

import calendar, datetime
d = datetime.datetime.utcnow()
print calendar.timegm(d.timetuple())

Answer 3

请注意,Python now(3.5.2)在对象中包含了一个内置方法datetime:

>>> import datetime
>>> now = datetime.datetime.now() 
>>> now.timestamp() # Local time
1509315202.161655
>>> now.replace(tzinfo=datetime.timezone.utc).timestamp() # UTC
1509329602.161655