VBB 2.2.8 Hacking date to gmdate

Hi,

I want to do this because i have problems displaying date with the date function and gmdate doesn't give any problems.

http://forum.scooterforum.net/tijd.php

Here is an example, if you refresh a couple of minutes, you will see the time change with hours.

Can you please tell which files i have to change to make my forum to gmdate?