python当地时间和UTC时间

>>> from datetime import datetime
>>> import time
>>> import calendar as cal

>>> utc_now = datetime.utcnow()    #当地时间
>>> now = datetime.now()    #UTC时间
>>> utc_now
datetime.datetime(2015, 3, 14, 2, 52, 37, 796958)
>>> now
datetime.datetime(2015, 3, 14, 10, 52, 44, 930170)
>>> cal.timegm(datetime.timetuple(utc_now)) #UTC时间戳
1426301557
>>>time.mktime(datetime.timetuple(now))
1426301564.0
 # time.mktime(tuple): this function always returns the timestamp in local time
#calendar.timegm(tuple): this returns the UTC timestamp from the supplied time tuple