<?php
$datetime1 = new DateTime("now");
$datetime2 = new DateTime('2015-05-13');
$interval = $datetime1->diff($datetime2);
echo $interval->format('%R%Y лет, %R%M месяцев, %R%D дней, %R%H часов, %R%I минут, %R%S секунд');
PD9waHAKCiRkYXRldGltZTEgPSBuZXcgRGF0ZVRpbWUoIm5vdyIpOwokZGF0ZXRpbWUyID0gbmV3IERhdGVUaW1lKCcyMDE1LTA1LTEzJyk7CiRpbnRlcnZhbCA9ICRkYXRldGltZTEtPmRpZmYoJGRhdGV0aW1lMik7CgplY2hvICRpbnRlcnZhbC0+Zm9ybWF0KCclUiVZINC70LXRgiwgJVIlTSDQvNC10YHRj9GG0LXQsiwgJVIlRCDQtNC90LXQuSwgJVIlSCDRh9Cw0YHQvtCyLCAlUiVJINC80LjQvdGD0YIsICVSJVMg0YHQtdC60YPQvdC0Jyk7Cg==