- var_dump: documentation ( source)
- time: documentation ( source)
- floor: documentation ( source)
- date_default_timezone_set: documentation ( source)
- strtotime: documentation ( source)
- sprintf: documentation ( source)
<?php
date_default_timezone_set('Europe/London');
$data = strtotime('2014-06-23 10:02:00');
var_dump($data);
$delta = time() - $data;
$sessionTime = sprintf("%02d%s%02d%s%02d", floor($delta/3600), ':', ($delta/60)%60, ':', $delta%60);
var_dump($sessionTime);