作业111

>>> from datetime import timedelta
>>> now + timedelta(hours=72)
datetime.datetime(2017, 10, 13, 10, 32, 10, 651001)
>>> datetime.strptime(‘2017年10月9日星期一9时10分0秒 UTC+8:00‘,‘%Y年%m月%d日星期一%H时%M分%S秒 UTC+8:00‘).timestamp()
1507511400.0
>>> now-timedelta(days=100)
datetime.datetime(2017, 7, 2, 10, 32, 10, 651001)
>>> datetime(2018,1,1)-now
datetime.timedelta(82, 48469, 348999)
>>> datetime.now()-timedelta(days=100)
datetime.datetime(2017, 7, 2, 11, 37, 41, 439001)
>>> datetime(2018,1,1)-datetime.now()
datetime.timedelta(82, 44507, 898999)
>>> datetime.now()-timedelta(days=100)).strftime(‘%Y-%m-%d‘)