[Septimius Severus]

Its actually pretty easy for Gandalf to just look at the log file (from which the external timer is extracted) and add x hours, but Gandalf did suggest what your saying as well, having the players do their own time zone calculations and indicate in their delay request the exact time in PST (server time) they'd like the server to host. They'd decide what time they wanted the server to host in their time zone, then either calculate the equivalent time in PST manually or else use one of the many programs on the Internet to do it.

I have so far been trying to make it as easy on the players as possible. But if all the players (and Gandalf) prefer this method instead, it might certainly make Gandalf's life easier.