1. Hold down the (A) button for about two seconds. [SET Hold] will appear, and then the time zone setting will flash. 2. Rotate the rotary switch to change the time zone. For information about time zones, see the "City Name List". ^{Solution 1: Set the Time Zone on G-Shock Watch. The process to set the time zone on your G-Shock watch may vary depending on the model and the module number of your watch. The module number is a four-digit or three-digit number that is engraved on the back of your watch. Module No. 5553 Adjusting the Current Time Setting Use the procedures below to adjust the current date and time settings, and to select a Home City. Setting a Home City Setting the Time/Date Switching between 12-hour and 24-hour Timekeeping Time Adjustment Adjusting the Current Time Setting Back Next Home CASIO official home page.} Tutorial video on how to change (adjust) the time zone on a Casio Gshock after travelling to a new country or a different time zone. I have shown 2 different ways of changing the .