import datetime
import time
now = datetime.datetime.now()
# print(now)
today = datetime.datetime.today()
# print(today)
strftime = datetime.datetime.strftime(now, '%Y/%m/%d %H:%M:%S')
# print(strftime) #2019/08/20 17:31:56
# 日期加1天，减一天，减去1个小时，减去1分钟都用timedelta可以实现
timedelta = datetime.timedelta(days=1)
today_timedelta = today + timedelta
today_timedelta_2 = today - timedelta
# print(today_timedelta) #2019-08-21 17:38:21.678296
# print(today_timedelta_2) # 2019-08-19 17:38:21.678296
datetime_hours = datetime.timedelta(hours=1)
# print(today+datetime_hours) #2019-08-20 18:40:20.140040
datetime_minutes = datetime.timedelta(minutes=15)
# print(today+datetime_minutes) #2019-08-20 17:56:20.555111
datetime_seconds = datetime.timedelta(seconds=60)
# print(today+datetime_seconds) #2019-08-20 17:43:13.314686
