如何在Python中将日期时间对象移动12小时

由于某种原因，日期时间对象让我很头疼。我写信是为了弄清楚如何将日期时间对象移动 12 小时。我还需要知道如何确定两个日期时间对象是否相差 1 分钟或更长时间。

The datetime http://docs.python.org/library/datetime.html图书馆有一个timedelta专门针对这种事情的对象：

import datetime

mydatetime = datetime.now() # or whatever value you want
twelvelater = mydatetime + datetime.timedelta(hours=12)
twelveearlier = mydatetime - datetime.timedelta(hours=12)

difference = abs(some_datetime_A - some_datetime_B)
# difference is now a timedelta object

# there are a couple of ways to do this comparision:
if difference > timedelta(minutes=1):
    print "Timestamps were more than a minute apart"

# or: 
if difference.total_seconds() > 60:
    print "Timestamps were more than a minute apart"