Custom Date Format

The custom date format field accepts the following characters:
d The day of the month, e.g. 1, 1st, 15, 15th, 31, 31st
ddd Abreviated name of the day, e.g. Mon, Tue, Wed
dddd Full name of the day, e.g. Monday, Tuesday, Wednesday
M The month number, e.g. 1, 12
MMM Abreviated month name, e.g. Jan, Feb, Dec
MMMM Full name of the momth, e.g. January, Febuary, December
yy Two digit year, e.g. 18, 19, 20
yy Four digit year, e.g. 2018, 2019, 2020
h Hour using a 12-hour clock, e.g. 1, 12
H Hour using a 24-hour clock, e.g. 1, 12
mm The minutes, e.g. 01, 59
ss The seconds, e.g. 01, 59
tt The AM/PM designator, e.g. AM, PM
For more format characters please click here.

Some examples are:
dddd, d MMMM yyyy Sunday, 1st September 2019
d/M/YY HH:mm:ss 31/12/19 23:59:00
h:mm:ss tt 11:59:30 PM