Times zone

How do i adjust the server time for my web site? I used a simple php script to get the time but it is’nt in my time zone. I try adjusting it thorugh the php script but certain times i get really wierd results…
my time zone is Standard Time +0800 UTC.
pls help
I’ve posted this message before and i dont understand what it means. can some one show me some code or somethin? im getting desperate!