<?php
// your code goes here
function pr($array_to_output)
{
print '<pre>';
print '</pre>';
}
$date = new DateTime();
pr( $date );
$date->modify("+20 minutes"); //or whatever value you want
pr( $date );
PD9waHAKCi8vIHlvdXIgY29kZSBnb2VzIGhlcmUKZnVuY3Rpb24gcHIoJGFycmF5X3RvX291dHB1dCkKewogICAgcHJpbnQgJzxwcmU+JzsKICAgIHByaW50X3IoJGFycmF5X3RvX291dHB1dCk7CiAgICBwcmludCAnPC9wcmU+JzsKfQoKCiRkYXRlID0gbmV3IERhdGVUaW1lKCk7CnByKCAkZGF0ZSApOwoKJGRhdGUtPm1vZGlmeSgiKzIwIG1pbnV0ZXMiKTsgLy9vciB3aGF0ZXZlciB2YWx1ZSB5b3Ugd2FudApwciggJGRhdGUgKTs=