timmah: The timezones are not set relative to GMT. They are relative to US central time. When I coded it I didn't feel like having to worry about the timezones. You just have to pick a timezone number which results in the correct time getting displayed. Also the dd/mm are swapped on accident.
My settings are dd/mm/yy and GMT 0 but the date and time given by this site is 11/07/04 3:16 PM when it should be 07/11/04 9:16 PM