For frequent globetrotters, transferring through time zones in quick succession, the new Henley World Timer is the watch for you. The Henley World Timer accomplishes a similar task to the GMT or dual time zone; it shows the wearer a time zone in an area of the world other than home. The difference is that whereas the GMT can only monitor one other selected time zone, the world timer shows the time for the main 24 time zones at once.