Datetime Format

Day Format	Value/Example
d	01 through 31
D	Mon through Sun
j	1 through 31
l (lowercase 'L')	Sunday throguh Saturday
N	1 (Monday) to 7 (Sunday)
S	st, nd, rd, th
w	0 (sunday) through 6 (Saturday)
z	0 through 365

Week Format	Value/Example
W	42 (42nd week in year)

Month Format	Value/Example
F	January through December
m	01 through 12
M	Jan through Dec
n	1 through 12
t	28 through 31

Year Format	Value/Example
L	1 (leap year), 0 otherwise
o	same as Y, except that it use week number to decide which year it falls onto
Y	1991, 2012, 2014, ...
y	91, 12, 14, ...

Time Format	Value/Example
a	am or pm
A	AM or PM
B	000 through 999
g	1 through 12
G	0 through 23
h	01 through 12
H	01 through 23
i	00 throguh 59
u	123456 (microseconds)

Timezone Format	Value/Example
e	UTC, GMT, Atlantic/Azores
I (capital i)	1 (daylight), 0 otherwise
O	+0200
P	+02:00
T	EST, MDT, ...
Z	-43200 through 50400 (timezone offset)

Date/Time Format	Value/Example
c	2004-02-12T15:19:21+00:00
r	Thu, 21 Dec 2000 16:01:07 +0200
U	seconds since Jan 1 1970 00:00:00 GMT