- time: documentation ( source)
- date_default_timezone_set: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
date_default_timezone_set('Europe/London');
$date = strtotime("November 22, 2017 12:01 AM");
$remaining = $date - time();
$str = date("H:i:s", $remaining);
Echo $str;