Original link: https://www.cnblogs.com/huhu-xiaomaomi/p/10338472.html
In python, date and date type datetime type dateTime is not comparable.
(1) To compare, may be converted to a dateTime date, date can not be converted directly dateTime
import datetime dateTime_p = datetime.datetime.now() date_p = dateTime_p.date() print(dateTime_p) #2019-01-30 15:17:46.573139 print(date_p) #2019-01-30
(2) the date of type date into a string str
#!/usr/bin/env python3
import datetime date_p = datetime.datetime.now().date() str_p = str(date_p) print(date_p,type(date_p)) #2019-01-30 <class 'datetime.date'> print(str_p,type(str_p)) #2019-01-30 <class 'str'>
(3) is converted to a string type str type dateTime
import datetime str_p = "30/01/2019 15:29:08" dateTime_p = datetime.datetime.strptime(str_p,'%Y-%m-%d %H:%M:%S') print(dateTime_p) # 2019-01-30 15:29:08
(4) dateTime type into str type
This place I do not understand why the format specified is invalid
import datetime dateTime_p = datetime.datetime.now() str_p = datetime.datetime.strftime(dateTime_p,'%Y-%m-%d') print(dateTime_p) # 2019-01-30 15:36:19.415157
(5) a string type to convert a date type str
#!/usr/bin/env python3 import datetime str_p = "01/30/2019" date_p = datetime.datetime.strptime(str_p,'%Y-%m-%d').date() print(date_p,type(date_p)) # 2019-01-30 <class 'datetime.date'>
Also type and date dateTime type can do this directly add 1 subtract operation 1
#!/usr/bin/env python3 import datetime # today = datetime.datetime.today() today = datetime.datetime.today().date() yestoday = today + datetime.timedelta(days=-1) tomorrow = today + datetime.timedelta(days=1) print(today) # 2019-01-30 print(yestoday)# 2019-01-29 print(tomorrow)# 2019-01-31