Symbol:  -  Description:
a  -  Displays "am" or "pm".
A  -  Displays "AM" or "PM".
B  -  Swatch Internet Time (between 000 and 999).
c  -  Date in ISO 8601 format.
d  -  Gives the day of the month, 2 digits with leading zeros; that is, "01" to "31".
D  -  Shows day of week, textual, 3 letters; for example, "Fri".
F  -  Displays month, textual, long; for example, "January".
h  -  Shows the hour, 12-hour format; that is, "01" to "12".
H  -  Shows the hour, 24 - hour format; that is, "00" to "23".
g  -  Shows the hour, 12 - hour without leading zeros; that is, "1" to "12".
G  -  Shows the hour, 24 - hour format without leading zeros; that is, "0" to "23".
i  -  Display the minutes; that is, "00" to "59".
I  -  Whether date is in DST (1) or not (0).
j  -  Gives the day of the month without leading zeros; that is, "1" to "31".
l  -  Gives the day of the week, textual, long; for example, "Friday".
L  -  Boolean for whether is a leap, year; that is, "0" or "1".
m  -  Shows the month, that is, "01" to "12".
M  -  Gives the month, textual, 3 letters; that for example, "Jan".
n  -  Shows the month, that is, "01" to "12".
O  -  Difference to GMT (for example, +0100 for one hour ahead).
s  -  Display the seconds; that is, "00" to "59".
S  -  Ordinal suffix for the day of month (st, nr, td, th).
r  -  Date in RFC 2822 format.
t  -  The number of days in the given month; that is, '28" to "31".
T  -  Timezone setting of this machine; for example, "MDT".
U  -  Displays the seconds since the epoch.
w  -  Shows the day of the week, numeric, that is, "0" (Sunday) to "6" (Saturday).
W  -  Week number (according to ISO 8601, from 1 to 53).
Y  -  Displays the year, 4 digits; for example, "2007".
y  -  Displays the year, 2 digits; for example, "07"
z  -  Shows the day of the year; that is, "0" to "365".
Z  -  Gives the timezone offset in seconds (that is, "-43200" to "43200").