Format Characters Used by the strftime() Function for Full Date and/or Time
Character Description
%c Preferred date and time representation for the current locale.
%D Current date; equivalent to %m/%d/%y.
%p a.m./p.m. indicator.
%R Time in 24-hour notation.
%r Time in 12-hour (am/pm) notation.
%T Current time; equivalent to %H:%M:%S.
%x Preferred date representation.
%X Preferred time representation.
%z or %Z Time zone.