PHP mktime() Function

Last Updated : 17 Mar 2025

The PHP mktime() function is used to find the day of that particular date. It returns the Unix timestamp for a date.

Syntax

Parameters

Parameter	Description	Required/Optional
Hour	Specifies the hour	optional
Minute	Specifies the minute	optional
Second	Specifies the second	optional
Month	Specifies the month	optional
Day	Specifies the day	optional
Year	Specifies the year	optional
Is_dst	Set this parameter to 1 as DST	optional

Return

The mktime() function returns the Unix timestamp of the arguments given. This function returns FALSE, if the arguments are invalid.

Example 1

<?php
// Prints: august 6, 2018 was on a monday
echo "Aug 6, 2018 was on a ".date("l", mktime(0,0,0,8,6,2018));
?>

Output:

Aug 6, 2018 was on a Monday.

Example 2

<?php
echo date("M-d-Y",mktime(0,0,0,12,36,2001)) . "\n";
echo date("M-d-Y",mktime(0,0,0,14,1,2001)) . "\n";
echo date("M-d-Y",mktime(0,0,0,1,1,2001)) . "\n";
echo date("M-d-Y",mktime(0,0,0,1,1,99)) . "\n";
?>

Output:

Jan-05-2002
Feb-01-2002
Jan-01-2001
Jan-01-1999

Example 3

<?php
$daylast = mktime(0, 0, 0, 3, 0, 2000);
echo strftime("Last day in Feb 2000 is: %d", $daylast);
echo ("\n");
$daylast = mktime(0, 0, 0, 4, -31, 2000);
echo strftime("Last day in Feb 2000 is: %d", $daylast);
?>

Output:

Last day in Feb 2000 is: 29
Last day in Feb 2000 is: 29

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