from datetime timport datetime
datetime.datetime.now()

datetime.date.today()

# 明天
atetime.date.today() + datetime.timedelta(days=1)
# 前N天
datetime.datetime.now()
datetime.datetime.now() - datetime.timedelta(days=3)

datetime.datetime.combine(datetime.date.today(), datetime.time.min)
datetime.datetime.combine(datetime.date.today(), datetime.time.max)

now = datetime.now()
end = datetime.strptime('2018-10-25 22:00','%Y-%m-%d %H:%M')
time = end - now
print(time.days,'天')

import datetime
today = datetime.date.today()
sunday = today + datetime.timedelta(6 - today.weekday())
sunday

import calendar
today = datetime.date.today()
last_day_num = calendar.monthrange(today.year, today.month)
last_day = datetime.date(today.year, today.month, last_day_num)
last_day

import datetime
today = datetime.date.today()
first = datetime.date(day=1, month=today.month, year=today.year)
lastMonth = first - datetime.timedelta(days=1)

import datetime
datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")

import datetime
datetime.datetime.strptime("2018-10-22 12:50:46", "%Y-%m-%d %H:%M:%S")

import datetime
datetime.datetime.now().timetuple()

timetuple => timestamp => datetime [看后面datetime<=>timestamp]

import datetime
datetime.datetime.now().date()

datetime.date.today()
today = datetime.date.today()
datetime.datetime.combine(today, datetime.time())
datetime.datetime.combine(today, datetime.time.min)

now = datetime.datetime.now()
timestamp = time.mktime(now.timetuple())
timestamp