If you are starting with an actual datetime field [dt]:
import datetime
dt = datetime.datetime(2019, 5, 31, 0, 0)
dt.strftime('
%Y%m%d
')
or
'{:%Y%m%d}'.format(dt)
For completeness' sake: you can also directly access the attributes of the object, but then you only get the numbers:
'%Y%m%d
' % (dt.month, dt.day, dt.year)
For reference, here are the codes used in format string:
%a Weekday as locale’s abbreviated name.
%A Weekday as locale’s full name.
%w Weekday as a decimal number, where 0 is Sunday and 6 is Saturday.
%d Day of the month as a zero-padded decimal number.
%b Month as locale’s abbreviated name.
%B Month as locale’s full name.
%m Month as a zero-padded decimal number. 01, ..., 12
%y Year without century as a zero-padded decimal number. 00, ..., 99
%Y Year with century as a decimal number. 1970, 1988, 2001, 2013
%H Hour (24-hour clock) as a zero-padded decimal number. 00, ..., 23
%I Hour (12-hour clock) as a zero-padded decimal number. 01, ..., 12
%p Locale’s equivalent of either AM or PM.
%M Minute as a zero-padded decimal number. 00, ..., 59
%S Second as a zero-padded decimal number. 00, ..., 59
%f Microsecond as a decimal number, zero-padded on the left. 000000, ..., 999999
%z UTC offset in the form +HHMM or -HHMM (empty if naive), +0000, -0400, +1030
%Z Time zone name (empty if naive), UTC, EST, CST
%j Day of the year as a zero-padded decimal number. 001, ..., 366
%U Week number of the year (Sunday is the first) as a zero padded decimal number.
%W Week number of the year (Monday is first) as a decimal number.
%c Locale’s appropriate date and time representation.
%x Locale’s appropriate date representation.
%X Locale’s appropriate time representation.
%% A literal '%' character.