Adding to times in PHP
http://stackoverflow.com/questions/10557076/adding-two-time-values-of-similar-formats-using-php
<?php
$time = "06:58:00";
$time2 = "00:40:00";
$secs = strtotime($time2)-strtotime("00:00:00");
$result = date("H:i:s",strtotime($time)+$secs);
echo "ADDITION OF 2 TIMES: " . $result . "\n" ;