%a

abbreviated weekday name (e.g., Wed)

%A

full weekday name (e.g., Wednesday)

%b

abbreviated month name (e.g., Sep)

%B

full month name (e.g., September)

%c

date and time (e.g., 09/16/98 23:48:10)

%d

day of the month (16) [01-31]

%H

hour, using a 24-hour clock (23) [00-23]

%I

hour, using a 12-hour clock (11) [01-12]

%M

minute (48) [00-59]

%m

month (09) [01-12]

%p

either "am" or "pm" (pm)

%S

second (10) [00-61]

%w

weekday (3) [0-6 = Sunday-Saturday]

%x

date (e.g., 09/16/98)

%X

time (e.g., 23:48:10)

%Y

full year (1998)

%y

two-digit year (98) [00-99]

%%

the character '%'