Unix date formatting cheat sheet

gistfile1.txt

Day
---
%a	weekday, abbreviated	Tue
%A	weekday, full	Tuesday
%d	day of the month (dd), zero padded	22
%e	day of the month (dd)	22
%j	day of year, zero padded	001-366
%u	day of week starting with Monday (1), i.e. mtwtfss	2
%w	day of week starting with Sunday (0), i.e. smtwtfs	2

Week
---
%U	week number Sunday as first day of week	00–53
%W	week number Monday as first day of week	01–53
%V	week of the year	01–53

Month
-----
%m	mm month	11
%h	Mon	Nov
%b	Mon, locale's abbreviated	Nov
%B	locale's full month, variable length	November

Year
---
%y	yy two digit year	00–99
%Y	ccyy year	2011
%g	2-digit year corresponding to the %V week number	
%G	4-digit year corresponding to the %V week number	

Century
-------
%C	cc century	00–99

Date
----
%D	mm/dd/yy	11/22/11
%x	locale's date representation (mm/dd/yy)	11/22/2011
%F	%Y-%m-%d	2011-11-22

Hours
-----
%l (Lowercase L)	hour (12 hour clock)	7
%I (Uppercase I)	hour (12 hour clock) zero padded	07
%k	hour (24 hour clock)	7
%H	hour (24 hour clock) zero padded	07
%p	locale's upper case AM or PM (blank in many locales)	AM
%P	locale's lower case am or pm	am

Minutes
-------
%M	MM minutes	47

Seconds
-------
%s	seconds since 00:00:00 1970-01-01 UTC (Unix epoch)	1321948063
%S	SS second	00–60
(The 60 is necessary to accommodate a leap second)
%N	nanoseconds	000000000–999999999

Time
----
%r	hours, minutes, seconds (12-hour clock)	07:47:43 AM
%R	hours, minutes (24 hour clock)	hh:mm e.g. 07:47
%T	hours, minutes, seconds (24-hour clock)	07:47:43
%X	locale's time representation (%H:%M:%S)

Date and Time
-------------
%c	locale's date and time	Sat Nov 04 12:02:33 EST 1989

Time zone
---------
%z	-zzzz RFC-822 style numeric timezone	-0500
%Z	time zone (e.g., EDT) nothing if no time zone is determinable	EST