Automatic Map Change

I’ve recently started a GMStranded server but the map stays at the moment what I set it to start with.
I need something to change the map automaticly after every 3-5 hours.

Anyone got anything like this?

http://www.garrysmod.org/downloads/?a=view&id=99040

You can use this, not automatic, but the players in the server can vote for a change

Thanks. I believe that should do its job.