Create a timed stylesheet using PHP

http://www.prdesign-studio.co.uk/HarryRoberts/index.php?2007/09/10/08/15/29-create-a-timed-stylesheet-using-php
"Hi all, as this is the first tutorial I've posted I thought I'd make it an easy one (for my sake). Basically this tiny PHP script will show you how to make a stylesheet switch depending on the time of day, similar to the one found here."