1、time
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time.gmtime()
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2、time.strptime() time.strftime()
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3、datetime.time
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4、datetime.date.today()
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datetime.date.fromtimestamp(t)
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d.replace()
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5、时间周期: datetime.timedelta()
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获取三小时前:
now=datetime.datetime.now()
now-datetime.timedelta(hours=3)
datetime.datetime(2018, 1, 20, 8, 14, 45, 545000)
6、combine()
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7、calendar
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