My improvised PHP alarm

alarm.php

<?php

date_default_timezone_set('Europe/London');

$alarm = '06:00';
$musicFileToPlay = '~/Music/4\ non\ blondes/1-01\ Train.mp3';

$open = 'open'; // change this to what is the command in you OS. This works for MacOSX

while (true) {
    $date = date('H:i', time());
    sleep(30);
    if ($alarm === $date) {
        echo 'Wake up!';
        system ("$open $musicFileToPlay");
        exit(0);
    }
}