python datetime 模块

import datetime

datetime.datetime.now()  打印本地当前时间

>>> print(datetime.datetime.now())
2017-12-20 17:30:31.035954

时间戳直接转成日期格式

>>> print(datetime.date.fromtimestamp(time.time()))
2017-12-20

把当前时间以指定的日期格式打印出来

>>> print(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S'))
2017-12-20 17:33:44

datetime.timedelta()  时间加减
显示当前时间+3天时间

print(datetime.datetime.now() + datetime.timedelta(days=3))

2017-12-24 10:53:23.549693

显示当前时间 -3天时间

print(datetime.datetime.now() + datetime.timedelta(days=-3))

2017-12-18 10:53:23.549693

当前时间+3小时

print(datetime.datetime.now() + datetime.timedelta(hours=3))

2017-12-21 13:53:23.549693

当前时间+30分钟

print(datetime.datetime.now() + datetime.timedelta(minutes=30))

2017-12-21 11:23:23.549693

自定义时间

c_time = (datetime.datetime.now())
print(c_time.replace(year=2016,month=3,day=5,hour=5,minute=5,second=40))

2016-03-05 05:05:40.549693