本节内容
1、datetime.datetime.now
2、datetime.date.fromtimestamp
3、datetime.timedelta
4、时间替换
1、datetime.datetime.now()
功能：返回当前时间，格式如：2016-08-19 12:47:03.941925
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>>> import datetime
>>> print(datetime.datetime.now())
2017-03-31 10:22:09.819373
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2、datetime.date.fromtimestamp()
功能：时间戳转换为日期格式
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>>> import datetime,time
>>> t = datetime.date.fromtimestamp(time.time())
>>> print(t) #把当天日期的时间戳转换为当天日期
2017-03-31
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3、datetime.timedelta()
功能：对某个时间的加减
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>>> import datetime
#当前时间加3天>>> t1 = datetime.datetime.now() + datetime.timedelta(days=3)
>>> print(t1)
2017-04-03 10:42:50.714910
#当前时间减3天>>> t1 = datetime.datetime.now() - datetime.timedelta(days=3)
>>> print(t1)
2017-03-28 10:43:17.260111
#当前时间减3天>>> t1 = datetime.datetime.now() + datetime.timedelta(days=-3)
>>> print(t1)
2017-03-28 10:43:35.758742
#当前时间加3个小时>>> t1 = datetime.datetime.now() + datetime.timedelta(hours=3)
>>> print(t1)
2017-03-31 13:44:24.805354
#当前时间加30分钟>>> t1 = datetime.datetime.now() + datetime.timedelta(minutes=30)
>>> print(t1)
2017-03-31 11:14:55.990195
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4、时间替换
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>>> import datetime
>>> c_time = datetime.datetime.now()
#当前时间输出>>> print(c_time)
2017-03-31 10:47:22.682289
#时间替换>>> update_c_time = c_time.replace(minute=3,hour=2)
#替换后的时间输出>>> print(update_c_time)
2017-03-31 02:03:22.682289
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