from datetime import datetime
from datetime import date
import time
#datetime()和time()
"""
datetime common module types:
date: date, common properties: year, month, day
time: time
datetime: date and time, common attributes: hour, minute, second, microsecond
timedelta: the length of the time interval between two time points
datetime module constants:
MAXYEAR, datetime.MAXYEAR maximum year
MINYEAR, datetime.MINYEAR year minimum
"""
# (A) Class DATE
TD = datetime.today ()
Print ( " Today IS " , TD) # acquires the current date, time: 2019-11-2420: 17: 28.933784
# Get the current date a method
Print ( " Today's year IS " , td.year) # current Year: 2019
Print ( " Today's month The IS " , td.month) # the current month: 11
Print ( " Today's day IS " , td.day) # the current day: 24
# Method for obtaining the current year, month, day two: .__ getattribute __ () method
Print ( " 20,191,102's year IS " , td. __Getattribute__ ( " year " )) # Current Year: 2019
Print ( " 20,191,102's month The IS " ., Td __getattribute__ ( " month The " )) # the current month: 11
Print ( " 20,191,102 IS's day " ., td __getattribute__ ( " day " )) # the current day: 24
# .Fromtimestamp () method, by a given timestamp, returns the corresponding date object
Print (datetime.fromtimestamp (the time.time ())) # 2019-11-25 06: 59: 23.325629
Print (datetime.utcfromtimestamp (Time .time ())) # 2019-11-24 22 is: 59: 23.325629 difference 8 hours
Print (date.fromtimestamp (the time.time ())) # 2019-11-25
print (datetime.now()) #2019-11-25 06:59:23.325629
print (datetime.now().date()) #2019-11-25
print (datetime.now().time()) #06:59:23.325629
print (datetime.utcnow()) #2019-11-24 22:59:23.325629 差8小时
print (time.time()) #1574636363.3256292
print (datetime.today()) #2019-11-25 07:03:10.692589
print (datetime.today().date()) #2019-11-25
print (date.today()) #2019-11-25
"" " Method is used to compare the size of date:
Illustrate the use of the method name method
__eq __ (...) is equal to (x == y) x .__ eq __ (y)
__ge __ (...) greater than or equal (x> = y) x .__ ge __ (y)
__gt __ (...) is larger than (x> y) x .__ gt __ (y)
__le __ (...) or less (x <= y) x .__ le __ (y)
__lt__(…) 大于(x<y) x.__lt__(y)
__ne __ (...) is not equal to (x! = y) x .__ ne __ (y)
__sub__(…) x - y x.__sub__(y)
__rsub __ (...) and - x x .__ __ rsub (y)
"""
a=date(2017,3,1)
b=date(2017,3,15)
print("a=b，a.__eq__(b)",a.__eq__(b)) #
print("a≥b，a.__ge__(b)",a.__ge__(b)) #
print("a>b，a.__gt__(b)",a.__gt__(b)) #
print("a≤b，a.__le__(b)",a.__le__(b)) #
print("a<b，a.__lt__(b)",a.__lt__(b)) #
print("a!=b，a.__ne__(b)",a.__ne__(b)) #
print("a-b，.__sub__(b)",a.__sub__(b)) # -14 days, 0:00:00
print("b-a，a.__rsub__(b)",a.__rsub__(b)) # 14 days, 0:00:00
print("a-b，.__sub__(b)",a.__sub__(b).days) #14 (days obtain a phase difference, using .days)
Print ( " BA, A .__ RSUB __ (B) " , A. __Rsub__ (B) .days) # 14 (number of days difference acquired using .days)
"""
ISO-compliant date, three methods:
1, isocalendar (...): returns a tuple containing three values were: year year, week number of weeks, weekday weeks (Monday as 1 ... Sunday, 7):
2, isoformat (...): Returns the date strings conform to the ISO 8601 standard (YYYY-MM-DD) of
3, isoweekday (...): Returns the specified date in accordance with ISO standards where the number of weeks (Monday as 1 ... Sunday 7)
"" "
Print (a.isocalendar ()) # (2017,. 9,. 3)
Print (a.isocalendar () [0]) # acquired in
Print (a.isocalendar () [. 1]) # Get the number of weeks
Print ( a.isocalendar () [2]) # Gets week
Print (a.isoformat ()) # 2017-03-01
Print (a.isoweekday ()) # get the number of weeks
Print (a.weekday ()) # Gets week, Monday is 0
"""
Date Format: date into str, date display into a string
__format __ (...) method of outputting the date (and this method is equivalent to the strftime method (...)) to specify the format, or using .__ str __ () method
"""
print (a.__str__()) #2017-03-01
print (a.__format__("%Y-%m-%d")) #2017-03-01
print (a.strftime("%Y-%m-%d")) #2017-03-01
Print (A. __format__ ( " % the Y /% m /% D " )) # 2017/03/01 (uppercase the Y)
Print (a.strftime ( " % the Y /% m /% D " )) # 2017 / 03/01 (uppercase Y)
Print (A. __format__ ( " % D% the Y% m " )) # 20,170,301 (uppercase Y)
Print (a.strftime ( " % D% the Y% m " )) # 20,170,301 (uppercase Y)
Print (A. __format__ ( " % Y /% m /% D " )) # 17/03/01 (lowercase Y)
Print (a.strftime ( " % Y /% m /% D " )) # . 17 / 03/01 (lowercase y)
print (a.__format__("%D")) #03/01/17
print (a.strftime("%D")) #03/01/17
# Date exercises; calculating difference date, a method: direct Save
SUM = 0
dates = ['2019-1-2','2019-1-27','2019-2-25','2019-3-25','2019-4-22','2019-5-20','2019-6-16','2019-7-19','2019-8-15','2019-9-10','2019-10-9','2019-10-31','2019-11-24']
for i in range(len(dates)-1):
dateq = datetime.strptime (a dates [I], ' %% Y-M-% D ' ) .date () # string format into date format
dateh = datetime.strptime (a dates [I +. 1], ' % the Y - M-% D% ' ) .date () # string format into date format
Print (dateq, dateh, End = ' ' ) # , End =' 'does not wrap, a box end of the line display
datec = dateh - dateq # difference between the two dates
Print ( ' separated: ' , datec.days)
SUM + = datec.days
Print ( " Total separated: " , SUM, " number: " , len (a dates) -1 )
Print ( " average total apart:.%. 2F " % (SUM / (len (a dates) -1 )))
# Date exercises; calculating difference date, two: __sub __ () method
SUM = 0
dates = ['2019-1-2','2019-1-27','2019-2-25','2019-3-25','2019-4-22','2019-5-20','2019-6-16','2019-7-19','2019-8-15','2019-9-10','2019-10-9','2019-10-31','2019-11-24']
for i in range(len(dates)-1):
dateq = datetime.strptime (a dates [I], ' %% Y-M-% D ' ) .date () # string format into date format
dateh = datetime.strptime (a dates [I +. 1], ' % the Y - M-% D% ' ) .date () # string format into date format
Print (dateq, dateh, End = ' ' ) # , End =' 'does not wrap, a box end of the line display
datec = dateh. __sub__ (dateq) # difference between the two dates
Print ( ' separated: ' , datec.days)
SUM + = datec.days
Print ( " Total separated: " , SUM, " number: " , len (a dates) -1 )
Print ( " average total apart:.%. 2F " % (SUM / (len (a dates) -1 )))
"""
# Common errors:
问题：TypeError: descriptor 'date' requires a 'datetime.datetime' object but received a 'int'
Original content:
from datetime import date
a = datetime.date(2017,3,1)
The reason: When you import the module, the module is imported from a datetime date, so the date when writing class, you can write directly, without adding datetime
Modified content:
from datetime import date
a = date(2017,3,1)
or
import datetime
a = datetime.date(2017,3,1)
"""
Today is 2019-11-25 07:22:49.569223
Today's year is 2019
Today's month is 11
Today's day is 25
20191102's year is 2019
20191102's month is 11
20191102's day is 25
2019-11-25 07:22:49.569223
2019-11-24 23:22:49.569223
2019-11-25
2019-11-25 07:22:49.569223
2019-11-25
07:22:49.569223
2019-11-24 23:22:49.569223
1574637769.5692234
2019-11-25 07:22:49.569223
2019-11-25
2019-11-25
a=b，a.__eq__(b) False
a≥b，a.__ge__(b) False
a>b，a.__gt__(b) False
a≤b，a.__le__(b) True
a<b，a.__lt__(b) True
a!=b，a.__ne__(b) True
a-b，.__sub__(b) -14 days, 0:00:00
b-a，a.__rsub__(b) 14 days, 0:00:00
a-b，.__sub__(b) -14
b-a，a.__rsub__(b) 14
(2017, 9, 3)
2017
9
3
2017-03-01
3
2
2017-03-01
2017-03-01
2017-03-01
2017/03/01
2017/03/01
20170301
20170301
17/03/01
17/03/01
03/01/17
03/01/17
2019-01-02 2019-01-27 apart: 25
2019-01-27 2019-02-25 apart: 29
2019-02-25 2019-03-25 apart: 28
2019-03-25 2019-04-22 apart: 28
2019-04-22 2019-05-20 apart: 28
2019-05-20 2019-06-16 apart: 27
2019-06-16 2019-07-19 apart: 33
2019-07-19 2019-08-15 apart: 27
2019-08-15 2019-09-10 apart: 26
2019-09-10 2019-10-09 apart: 29
2019-10-09 2019-10-31 apart: 22
2019-10-31 2019-11-24 apart: 24
Total apart: 326: 12
Average spaced Total: 27.17
2019-01-02 2019-01-27 apart: 25
2019-01-27 2019-02-25 apart: 29
2019-02-25 2019-03-25 apart: 28
2019-03-25 2019-04-22 apart: 28
2019-04-22 2019-05-20 apart: 28
2019-05-20 2019-06-16 apart: 27
2019-06-16 2019-07-19 apart: 33
2019-07-19 2019-08-15 apart: 27
2019-08-15 2019-09-10 apart: 26
2019-09-10 2019-10-09 apart: 29
2019-10-09 2019-10-31 apart: 22
2019-10-31 2019-11-24 apart: 24
Total apart: 326: 12
Average spaced Total: 27.17