Oh it sounds easy... and it is! Still, I know people in the watch business that still do not know how to set a G.M.T. watch. Follow these simple instructions, most G.M.T.'s function with two hour hands, so set one hour hand to the outward bezel of the watch. Next, set the hour hand used on the normal dial, (it typically moves independently to set the date and the time). There is is! You have set two time zones. Now CTWG, what about the scary 24-hour outward bezel “it is not americanized to our time system? Yes, it can be tough to subtract 12, but we must advance as a culture. Besides, the bezel almost always has a dark/light look to indicate day/night time (use this to your advantage). Happy setting CTWG