<?php
 
$date = date_create('2014-05-09');
 
addInterval( $date, '10 days'); // 10 дней
addInterval( $date, '5 weeks'); // 5 недель
addInterval( $date, '1 month'); // 1 месяц
addInterval( $date, '2 years'); // 2 года
 
function addInterval( $date, $interval){
	$newDate = clone $date;
    date_add($newDate, date_interval_create_from_date_string( $interval));
    printf( "%s + \"%s\" = %s\n",
        date_format($date, 'Y-m-d'),
        $interval,
        date_format($newDate, 'Y-m-d')
    );
}
 
 

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