Format Output Description
%a Sun, Mon, …, Sat (en_US); Weekday as locale’s abbreviated name.
%A Sunday, Monday, …, Saturday (en_US); Weekday as locale’s full name.
%w 0, 1, …, 6 Weekday as a decimal number, where 0 is Sunday and 6 is   Saturday.
%d 01, 02, …, 31 Day of the month as a zero-padded decimal number.
%b Jan, Feb, …, Dec (en_US); Month as locale’s abbreviated name.
%B January, February, …, December (en_US); Month as locale’s full name.
%m 01, 02, …, 12 Month as a zero-padded decimal number.
%y 00, 01, …, 99 Year without century as a zero-padded decimal number.
%Y 0001, 0002, …, 2013, 2014, …, 9998, 9999 Year with century as a decimal number.
%H 00, 01, …, 23 Hour (24-hour clock) as a zero-padded decimal number.
%I 01, 02, …, 12 Hour (12-hour clock) as a zero-padded decimal number.
%p AM, PM (en_US); Locale’s equivalent of either AM or PM.
%M 00, 01, …, 59 Minute as a zero-padded decimal number.
%S 00, 01, …, 59 Second as a zero-padded decimal number.
%f 000000, 000001, …, 999999 Microsecond as a decimal number, zero-padded to 6 digits.
%z (empty), +0000, -0400, +1030, +063415, -030712.345216 UTC offset in the form ±HHMM[SS[.ffffff]] (empty string if the object is naive).
%Z (empty), UTC, GMT Time zone name (empty string if the object is naive).
%j 001, 002, …, 366 Day of the year as a zero-padded decimal number.
%U 00, 01, …, 53 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.
%W 00, 01, …, 53 Week number of the year (Monday as the first day of the week)   as a decimal number. All days in a new year preceding the first Monday are   considered to be in week 0.
%c Tue Aug 16 21:30:00 1988 (en_US); Locale’s appropriate date and time representation.
%x 08/16/88 (None); Locale’s appropriate date representation.
%X 21:30:00 (en_US); Locale’s appropriate time representation.
%% % A literal '%'   character.

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Source: https://docs.python.org/3/library/datetime.html#strftime-and-strptime-format-codes