Although there is a substantial movement for alternative usage guidelines (Copyleft, Creative Commons, etc) I haven’t found a client yet that wasn’t just a little concerned about commercial usage rights. Given that, however, a quick tour around will find many business sites with outdated copyright dates on them. So here are three snippets of code I use to keep copyright dates up-to-date on sites without having to manually update them every year.
This part is placed wherever you want your copyright text to appear. You can modify it with CSS as you please.
© Copyright 2004 - <?php echo date('Y'); ?>