[mysql] date_format() 에 사용되는 형식 구분자.

출처 : http://www.cyworld.com/susemi99/2394914


%a : Abbreviated weekday name (Sun..Sat)
%b : Abbreviated month name (Jan..Dec)
%c : Month, numeric (0..12)
%D : Day of the month with English suffix (0th, 1st, 2nd, 3rd, …)
%d : Day of the month, numeric (00..31)
%e : Day of the month, numeric (0..31)
%f : Microseconds (000000..999999)
%H : Hour (00..23)
%h : Hour (01..12)
%I : Hour (01..12)
%i : Minutes, numeric (00..59)
%j : Day of year (001..366)
%k : Hour (0..23)
%l : Hour (1..12)
%M : Month name (January..December)
%m : Month, numeric (00..12)
%p : AM or PM 
%r : Time, 12-hour (hh:mm:ss followed by AM or PM)
%S : Seconds (00..59)
%s : Seconds (00..59)
%T : Time, 24-hour (hh:mm:ss)
%U : Week (00..53), where Sunday is the first day of the week
%u : Week (00..53), where Monday is the first day of the week
%V : Week (01..53), where Sunday is the first day of the week; used with %X 
%v : Week (01..53), where Monday is the first day of the week; used with %x 
%W : Weekday name (Sunday..Saturday)
%w : Day of the week (0=Sunday..6=Saturday)
%X : Year for the week where Sunday is the first day of the week, numeric, four digits; used with %V 
%x : Year for the week, where Monday is the first day of the week, numeric, four digits; used with %v 
%Y : Year, numeric, four digits
%y : Year, numeric (two digits)
%% : A literal “%” character
%x : x, for any “x” not listed above