Umm... it's not hard... just use the [man]date[/man] function as I don't think you can change the server-time (since you'd have to have admin access to do that).....
function getmytime($zone)
{
$zone = (($zone*(60*60))!=date('Z'))?(($zone*(60*60))-date('Z')):0;
return date('H:i:s', time()+$zone);
}
Then, whenever you need to use it, just call it. That's almost your only option I think...
~Brett