Most watch manufactures have a GMT modeled watch. The main watch hands are normal 12 hour time, and you set the second hour hand to 24 hour time (usually GMT, hence the name). You then rotate the bezel, which has markings from 0-23 to the correct position off of the 24 hr hand, and can tell any timezone you want.
Rolex, for example, calls theirs the "GMT Master II."