您需要使用模块datetime和对象datetime.timedelta
from datetime import datetime
t1 = datetime.strptime("Mon, 17 Nov 2008 01:45:32 +0200","%a, %d %b %Y %H:%M:%s +0200")
t2 = datetime.Now()
tdelta = t2 - t1 # actually a datetime.timedelta object
print tdelta.days
602392714
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