Question

How do I subtract and/or add elapsed time to a date in the format yyyy-mm-dd hh:mm:ss?
ie how do I add 16:49:13 to 2012-06-18 22:03:18 ?

Also, how do I subtract 16:49:13 from 2012-06-19 14:52:31?
I need the results to be in the format hh:mm:ss

Answer 1

my quick idea:

<?php

$a="16:49:13"; 
$e=explode(':', $a);

$y="2012-06-18 22:03:18";

echo  date('d-m-Y h:i:s',strtotime("+ $e[0] hours $e[1] minutes $e[2] seconds ",strtotime($y)));

output: 19-06-2012 02:52:31