[929] datetime format (strftime() and strptime() Format Codes)

ref: strftime() and strptime() Format Codes

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The following is a list of all the format codes that the 1989 C standard requires, and these work on all platforms with a standard C implementation.

Type	Directive	Meaning	Example	Notes
Weekday	%a	Weekday as locale's abbreviated name.	Sun, Mon, Tue, Wed, Thu, Fri, Sat	(1)
	%A	Weekday as locale's full name.	Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday	(1)
	%w	Weekday as a decimal number, where 0 is Sunday and 6 is Saturday.	0, 1, 2, 3, 4, 5, 6
Day	%d	Day of the month as a zero-padded decimal number.	01, 02, 03, 04, 05,..., 10, 11,12, ...,29, 30, 31	(9)
Month	%b	Month as locale's abbreviated name.	Jan, Feb, …, Jul, Aug, ..., Nov, Dec	(1)
	%B	Month as locale's full name.	January, February, …, November, December	(1)
	%m	Month as a zero-padded decimal number.	01, 02, …, 07, 08, ..., 11, 12	(9)
Year	%y	Year without century as a zero-padded decimal number.	00, 01, …, 50, 51, ..., 98, 99	(9)
	%Y	Year with century as a decimal number.	0001, 0002, …, 2013, 2014, …, 9998, 9999	(2)
Hour	%H	Hour (24-hour clock) as a zero-padded decimal number.	00, 01, …, 10, 11, ..., 22, 23	(9)
	%I	Hour (12-hour clock) as a zero-padded decimal number.	01, 02, …, 7, 8, ..., 11, 12	(9)
	%p	Locale's equivalent of either AM or PM.	AM, PM (en_US)	(1), (3)
Minute	%M	Minute as a zero-padded decimal number.	00, 01, …, 24, 25, ..., 58, 59	(9)
Second	%S	Second as a zero-padded decimal number.	00, 01, …, 24, 25, ..., 58, 59	(4), (9)
	%f	Microsecond as a decimal number, zero-padded to 6 digits.	000000, 000001, …, 999999	(5)
	%z	UTC offset in the form ±HHMM[SS[.ffffff]] (empty string if the object is naive).	(empty), +0000, -0400, +1030, +063415, -030712.345216	(6)
	%Z	Time zone name (empty string if the object is naive).	(empty), UTC, GMT	(6)
	%j	Day of the year as a zero-padded decimal number.	001, 002, …, 366	(9)
	%U	Week number of the year (Sunday as the first day of the week) as a zero-padded decimal number. All days in a new year preceding the first Sunday are considered to be in week 0.	00, 01, …, 53	(7), (9)
	%W	Week number of the year (Monday as the first day of the week) as a zero-padded decimal number. All days in a new year preceding the first Monday are considered to be in week 0.	00, 01, …, 53	(7), (9)
	%c	Locale's appropriate date and time representation.	Tue Aug 16 21:30:00 1988 (en_US); Di 16 Aug 21:30:00 1988 (de_DE)	(1)
	%x	Locale's appropriate date representation.	08/16/88 (None); 08/16/1988 (en_US); 16.08.1988 (de_DE)	(1)
	%X	Locale's appropriate time representation.	21:30:00 (en_US); 21:30:00 (de_DE)	(1)

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Examples: 

from datetime import datetime

dt = datetime.now().date() 

dt

# output
# datetime.date(2023, 11, 1)

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datetime.strftime(dt, "%d-%b-%Y %A")

# output
# '01-Nov-2023 Wednesday'

datetime.strftime(dt, "%d/%m/%Y")

# output
# '01/11/2023'

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date_str = "2021-11-1"

datetime.strptime(date_str, "%Y-%m-%d")

# output
# datetime.datetime(2021, 11, 1, 0, 0)

date_str = "2021/11/01"

datetime.strptime(date_str, "%Y/%m/%d") 

# output
# datetime.datetime(2021, 11, 1, 0, 0)