Conversions
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Day
%a abbreviated weekday name.
%A full weekday name.
%d day of the month [01,31].
%e day of the month [1,31]; 
%j day of the year [001,366].

Month
%b abbreviated month name.
%B full month name.
%m month [01,12].

Year
%y year without century [00,99].
%Y full year.

Week
%u weekday [1,7], with 1 representing Monday.
%U week number of the year (Sunday as the first day of the week) [00,53].
%V week number of the year (Monday as the first day of the week) [01,53]. 
%w weekday [0,6], with 0 representing Sunday.
%W week number of the year (Monday as the first day of the week) [00,53].

Hour
%H hour (24-hour clock) [00,23].
%I hour (12-hour clock) [01,12].

Minute
%M minute [00,59].

Second
%S second [00,61].

AM/PM
%p a.m. or p.m.

Timezone
%Z timezone name.

Combinations
%c date and time.
%D same as %m/%d/%y.
%r time in a.m. and p.m. notation.
%R time in 24 hour notation (%H:%M).
%T time (%H:%M:%S).
%x date.
%X time.