PHP strftime() function

%a - abbreviation for day of the week name

%A - the full name of the day of the week

%b - abbreviation for month name

%B - Full month name

%c - Preferred date and time representation

%C - century number (year divided by 100, range 00 to 99)

%d - day of the month (01 to 31)

%D - time format, same as %m/%d/%y notation

%e - day of the month (1 to 31)

%g - similar to %G notation, but without the century

%G - 4-digit year corresponding to ISO week number (see %V)

%h - same notation as %b

%H - hour, using 24-hour clock (00 to 23)

%I - hour, using 12-hour clock (01 to 12)

%j - Day of the year (001 to 366)

%m - month (01 to 12)

%M - points

%n - newline character

%p - am or pm corresponding to the given time value

%r - time notation for am and pm

%R - 24-hour time notation

%S - seconds

%t - tab tab character

%T - current time, same notation as %H:%M:%S

%u - Numeric representation of the day of the week (1 to 7), Monday = 1. Warning: Sunday = 1 on Sun Solaris systems

%U - the number of weeks included in the current year, starting with the first Sunday as the first day of week 1

%V - The number of weeks (01 to 53) in ISO 8601 format contained in the current year. Week 1 represents the first week of the year, which must have at least four days, and Monday is the first day of the week.

%W - the number of weeks included in the year, starting with the first Monday as the first day of week 1

%w - Day of the week as a decimal number, Sunday = 0

%x - Preferred date representation without time

%X - Preferred time representation without date

%y - year representation without century digits (range 00 to 99)

%Y - Year representation including a digit representing the century

%Z or %z - time zone name or abbreviation

%% - output a % character