- round: documentation ( source)
- mktime: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
echo date('Y-m-d H:i:s', strtotime('2013-07-31 23:59:20') + 4*60*60);
echo '<br>';
echo date("M-d-Y", mktime(0, 0, 0, 13, 1, 1997));
echo round('4255,00', 2);