convert_locale_date()

date_string

string representing a date

format

one or more symbols that describe the format of date_string For a list of format symbols, see Format Symbols for convert_locale_date(). Each symbol is composed of a percent (%) sign followed by one or two characters. If you use more than one symbol, separate each symbol by a space. 

Default 
day month date time year (Fri Jan 2 08:00:00 1970)

%%

allows you to use a percent sign (%) in the format of a date string

%a

locale's name of the day of week; either the abbreviated or full name may be specified.

%A

same as %a

%b

locale's name of the month; either the abbreviated or full name may be specified.

%B

same as %b

%c

locale's appropriate date and time representation

%C

century number [0,99]; leading zero is permitted but not required (no change to tm)

%d

day of month [1,31]; leading zero is permitted but not required

%D

date as %m/%d/%y

%e

same as %d

%h

same as %b

%H

hour (24-hour clock) [0,23]; leading zero is permitted but not required

%I

hour (12-hour clock) [1,12]; leading zero is permitted but not required

%j

day of year [1,366]; leading zeros are permitted but not required

%m

month as a decimal number [1,12]; leading zero is permitted but not required

%M

minute [0,59]; leading zero is permitted but not required

%n

any white space

%p

locale's equivalent of either a.m. or p.m.

%r

appropriate time representation in 12-hour clock format with %p

%R

time as %H:%M

%S

seconds [0,61]; leading zero is permitted but not required

%t

any white space

%T

time as %H:%M:%S

%U (UNIX or Linux OS only)

week of the year as a decimal number [0,53], with Sunday as the first day of the week; leading zeros are permitted but not required (no change to tm)

%w

day of week as a decimal number [0,6], with 0 representing Sunday

%W

week of the year as a decimal number [0,53], with Monday as the first day of the week; leading zero is permitted but not required (No change to tm)

%x

locale's appropriate date representation

%X

locale's appropriate time representation

%y

year within the century [0,99]; leading zero is permitted but not required

%Y

year, including the century (for example 1993)

%Z

name of time zone, or no characters if no information of the time zone exists