It's an odd problem, I can set the board time zone in the admin section. My host is on PST time, the board accepts GMT time, so the correct setting would be GMT-8, which is what the board used to be on, but it would be off by 8 hours.
I haven't had a chance to look into the issue on the phpBB support boards yet, but I am faily sure it is a phpBB code problem, will get to it eventually.