- var_dump: documentation ( source)
- mktime: documentation ( source)
- date_default_timezone_set: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
date_default_timezone_set('Europe/London');
var_dump(date('d/m/Y H:i:s', mktime(0, 0, 0)));
var_dump(date('d/m/Y H:i:s', strtotime('-9 day midnight')));