Table 1: strftime conversion specifiers

%a    abbreviated weekday name (Sun)
%A    full weekday name (Sunday)
%b    abbreviated month name (Dec)
%B    full month name (December)
%c    date and time (Dec  2 06:55:15 1979)
%d    day of the month (02)
%H    hour of the 24-hour day (06)
%I    hour of the 12-hour day (06)
%j    day of the year, from 001 (335)
%m    month of the year, from 01 (12)
%M    minutes after the hour (55)
%p    AM/PM indicator (AM)
%S    seconds after the minute (15)
%U    Sunday week of the year, from 00 (48)
%w    day of the week, from 0 for Sunday (6)
%W    Monday week of the year, from 00 (47)
%x    date (Dec  2 1979)
%X    time (06:55:15)
%y    year of the century, from 00 (79)
%Y    year (1979)
%Z    time zone name, if any (EST)
%%    percent character %