%a Abbreviated weekday name
%A Full weekday name
%b Abbreviated month name
%B Full month name
%c Date and time representation appropriate for locale
%d Day of month as decimal number (01~31)
%H Hour in 24-hour format (00~23)
%I Hour in 12-hour format (01~12)
%j Day of year as decimal number (001~366)
%m Month as decimal number (01~12)
%M Minute as decimal number (00~59)
%p Current locale's A.M./P.M. indicator for 12-hour clock
%S Second as decimal number (00~59)
%U Week of year as decimal number, with Sunday as first day of week (00~53)
%w Weekday as decimal number (0~6; Sunday is 0)
%W Week of year as decimal number, with Monday as first day of week (00~53)
%x Date representation for current locale
%X Time representation for current locale
%y Year without century, as decimal number (00~99)
%Y Year with century, as decimal number
%z, %Z Either the time-zone name or time zone abbreviation, depending on registry settings; no characters if time zone is unknown
%% Percent sign