if you use unsynced quads they will be synced on the client time (how long the client is active already, restarts at a restart of the game).
chillerdragon and i discovered this when we were about to make a clock in a map. It used unsyncec quads and we wanted to have always the right time. it would have been possible because the server has a restart script that restarts it at 00:00. But it didnt work because the unsynced Quads are synced on the client time and not on the server time so its ...