it converts date/time into a Unix timestamp

<?php
echo strtotime(“17 May 1984”);
?>

Output

453580200

it parses  time/date generated with strftime()

<?php
echo “<pre>”;
$format = ‘%d/%m/%Y %H:%M:%S’;
$strftime = strftime($format);
echo $strftime.”<br />”;
print_r(strptime($strf, $format));
?>

Output

25/04/2012 12:52:25

It formats a local time/date according to locale settings

<?php
setlocale(LC_TIME, “C”);
echo strftime(“%A”);
?>

Below given are the the formats

%a,%A,%d,%e,%j,%u,%w,%U,%V,%W,%b,%B,%h,%m,%C,%g,%G,%y,%Y,%H,%I,%l,%M,%p,%P,%r,%R,%S,%T,%X,%z,%Z

Output

Wednesday

It returns Unix timestamp for a date

<?php
echo date(“M-d-Y”, mktime(0, 0, 0, 12, 32, 2007));
?>

Output

Jan-01-2008

It return current Unix timestamp with microseconds

Example

<?php
echo microtime();
?>

Output

microtime

It returns the local time

<?php
echo “<pre>”;
$localtime = localtime();
print_r($localtime);
?>

 

Output

Array
(
[0] => 10
[1] => 23
[2] => 12
[3] => 25
[4] => 3
[5] => 112
[6] => 3
[7] => 115
[8] => 0

it formats a GMT/UTC time/date according to locale settings

<?php
setlocale(LC_TIME, ‘en_US’);
echo strftime(“%b %d %Y %H:%M:%S”, mktime(17, 0, 0, 12, 31, 97)) . “<br />”;
echo gmstrftime(“%b %d %Y %H:%M:%S”, mktime(17, 0, 0, 12, 31, 97)) ;
?>

Output

Dec 31 1997 17:00:00
Dec 31 1997 11:30:00

It returns  Unix timestamp for a GMT date

<?php
echo “May 17, 1984 is on a ” . date(“l”, gmmktime(0, 0, 0, 7, 1, 2007));
?>

Output

May 17, 1984 is on a Sunday