- var_dump: documentation ( source)
- strtotime: documentation ( source)
<?php
$time1 = '2014-08-26 14:35:29';
$time2 = '2014-08-26 14:36:29';
$strtotime1 = strtotime($time1);
$strtotime2 = strtotime($time2);
echo $strtotime1;
echo "\n";
echo $strtotime2;
echo "\n";
echo $strtotime2 - $strtotime1;
$date = new DateTime('2014-08-26 14:36:29');
echo "\n";
var_dump($date);