A time zone converter--
http://www.timezoneconverter.com/cgi-bin/tzc.tzc
A map of the time zones--
http://www.travel.com.hk/region/timezone.htm
...If you need them...
What I do for time zones though is go click on the clock in the lower-left-hand corner of my computer screen (since you're all at computers anyway when playing this game). Double clicking on that brings up the "Date and Time Properties" window, if yours is like mine there should be three tabs: "Date and Time", "Time Zone" and "Internet Time". Go to the "Time Zone" one, make sure the check box for "Automatically adjust clock for daylight saving changes" is clicked then just set it to the timezone you're looking for click "Apply" make a note of the time and change it back to your timezone....problem solved (unless, of course, you get the wrong timezone...)
For Example:
I'm in "Eastern Time (US & Canada)" so that's what my computer clock is set to...It says that it's now 10:16am...Following what I described I can temporarily set my clock to GMT (3:17pm)...or GMT+800 (10:18pm)...and back (10:18am)...all within two minutes...
Incidently I'm sorry if this sounds like I'm talking down to you...y'know, explaining something you should have been able to see for yourselves...but I'm in a hurry and in a mildly bad mood because I've forgotten my glasses and so am starting to get a headache...I don't mean for it to sound that way and I really am sorry if it does....