Timezone and DST

Hi All, I've got a little problem where our servers are in PST but the customer operates in Hawaii (-10 GMT). I believe I can just get the time for them by doing something like date("d H i", strtotime('now -2 hours') ); But here's the catch, how should I deal with day light savings ( DST) . In hawaii they don't observer DST, but in Washington State we do. We're on php 4.x so I can't use the date_default_timezone_set <http://us2.php.net/manual/en/function.date-default-timezone-set.php> that was added in PHP 5 Thanks, Mark