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PHP mktime() Function

PHP Date Reference Complete PHP Date Reference

Definition and Usage

The mktime() function returns the Unix timestamp for a date.

This timestamp contains the number of seconds between the Unix Epoch (January 1 1970 00:00:00 GMT) and the time specified.

Syntax

mktime(hour,minute,second,month,day,year,is_dst)

Parameter Description
hour Optional. Specifies the hour
minute Optional. Specifies the minute
second Optional. Specifies the second
month Optional. Specifies the numerical month
day Optional. Specifies the day
year Optional. Specifies the year. The valid range for year is on some systems between 1901 and 2038. However this limitation is overcome in PHP 5
is_dst Optional. Set this parameter to 1 if the time is during daylight savings time (DST), 0 if it is not, or -1 (the default) if it is unknown. If it's unknown, PHP tries to find out itself (which may cause unexpected results). Note: This parameter became deprecated in PHP 5. The new timezone handling features should be used instead.

Tips and Notes

Note: If the arguments are invalid, the function returns false (PHP versions before 5.1 returns -1).

Example

The mktime() function is useful for doing date arithmetic and validation. It will automatically calculate the correct value for out-of-range input:

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

The output of the code above would be:

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

PHP Date Reference Complete PHP Date Reference
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