PHP date_modify() Function

Modify the timestamp. Add 15 days:

<?php
$date=date_create("2013-05-01");
date_modify($date,"+15 days");
echo date_format($date,"Y-m-d");
?>

Definition and Usage

The date_modify() function modifies the timestamp.

date_modify( object, modify)

Parameter	Description
object	Required. Specifies a DateTime object returned by date_create()
modify	Required. Specifies a date/time string

Return Value:	Returns a DateTime object on success. FALSE on failure
PHP Version:	5.2+
PHP Changelog:	PHP 5.3: Changed the return value from NULL to DateTime