PHP strftime() Function

The strftime function accepts a format string as a parameter, and formats the locale date/time according to the locale settings..
strftime($format [, $timestamp])

format(Optional)
This is a string value representing the format in which you need to format the date/time.
timestamp(Mandatory)
This is an integer value representing the Unix time stamp specifying the current time value.
PHP strftime() function retrurns a string value representing the formatted time. You can change the month and week day names to other language using the setlocale() method. 
This function was first introduced in PHP Version 5.3 and, works with all the later versions.
Following example demonstrates the usage of the strftime() function −
<?php
   $date = strftime("%A %d %B %G");
   $time = strftime("%T");
   print("Date: ".$date ."\n");
   print("Time: ".$time);
?>
This will produce following result −
Date: Wednesday 13 May 2020
Time: 06:28:07

Let us try this function by passing the time stamp parameter (along with the format) −
<?php
   $timestamp = mktime(7, 36, 45, 06, 25, 2017); 
   $date = strftime("%A %d %B %G %T", $timestamp );
   print("Date: ".$date ."\n");
?>
This will produce following result −
Date: Sunday 25 June 2017 07:36:45

following example prints the day of the week and month of a particular date in Catalan language −
<?php
   setlocale(LC_TIME, 'ca_ES', 'Catalan_Spain', 'Catalan');
   $date = strftime("%A %d %B %G %T");
   print("Date: ".$date ."\n");
?>
This will produce following result −
Date: dimecres 13 maig 2020 08:14:19

<?php
   setlocale(LC_TIME, 'en_US');   
   echo strftime("%b %d %Y %H:%M:%S", mktime(20, 0, 0, 12, 31, 2015)) . "\n";
   echo gmstrftime("%b %d %Y %H:%M:%S", mktime(20, 0, 0, 12, 31, 2015)) . "\n"; 
?>
This produces the following result −
Dec 31 2015 20:00:00
Dec 31 2015 20:00:00

Following are the various characters to format the date/time using strftime −
%a − abbreviated weekday name
%a − abbreviated weekday name
%A − full weekday name
%A − full weekday name
%b − abbreviated month name
%b − abbreviated month name
%B − full month name
%B − full month name
%c − preferred date and time representation
%c − preferred date and time representation
%C − century number (the year divided by 100, range 00 to 99)
%C − century number (the year divided by 100, range 00 to 99)
%d − day of the month (01 to 31)
%d − day of the month (01 to 31)
%D − same as %m/%d/%y
%D − same as %m/%d/%y
%e − day of the month (1 to 31)
%e − day of the month (1 to 31)
%g − like %G, but without the century
%g − like %G, but without the century
%G − 4-digit year corresponding to the ISO week number (see %V).
%G − 4-digit year corresponding to the ISO week number (see %V).
%h − same as %b
%h − same as %b
%H − hour, using a 24-hour clock (00 to 23)
%H − hour, using a 24-hour clock (00 to 23)
%I − hour, using a 12-hour clock (01 to 12)
%I − hour, using a 12-hour clock (01 to 12)
%j − day of the year (001 to 366)
%j − day of the year (001 to 366)
%m − month (01 to 12)
%m − month (01 to 12)
%M − minute
%M − minute
%n − newline character
%n − newline character
%p − either am or pm according to the given time value
%p − either am or pm according to the given time value
%r − time in a.m. and p.m. notation
%r − time in a.m. and p.m. notation
%R − time in 24 hour notation
%R − time in 24 hour notation
%S − second
%S − second
%t − tab character
%t − tab character
%T − current time, equal to %H:%M:%S
%T − current time, equal to %H:%M:%S
%u − weekday as a number (1 to 7), Monday=1. Warning: In Sun Solaris Sunday=1
%u − weekday as a number (1 to 7), Monday=1. Warning: In Sun Solaris Sunday=1
%U − week number of the current year, starting with the first Sunday as the first day of the first week
%U − week number of the current year, starting with the first Sunday as the first day of the first week
%V − The ISO 8601 week number of the current year (01 to 53), where week 1 is the first week that has at least 4 days in the current year, and with Monday as the first day of the week
%V − The ISO 8601 week number of the current year (01 to 53), where week 1 is the first week that has at least 4 days in the current year, and with Monday as the first day of the week
%W − week number of the current year, starting with the first Monday as the first day of the first week
%W − week number of the current year, starting with the first Monday as the first day of the first week
%w − day of the week as a decimal, Sunday=0
%w − day of the week as a decimal, Sunday=0
%x − preferred date representation without the time
%x − preferred date representation without the time
%X − preferred time representation without the date
%X − preferred time representation without the date
%y − year without a century (range 00 to 99)
%y − year without a century (range 00 to 99)
%Y − year including the century
%Y − year including the century
%Z or %z − time zone or name or abbreviation
%Z or %z − time zone or name or abbreviation
%% − a literal % character
%% − a literal % character

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