How Do I Change the Timezone on My G-Shock Watch?

by Megan Mattingly-Arthur ; Updated September 28, 2017

Casio G-Shock wrist watches use a radio-controlled time signal broadcast from Fort Collins, Colorado to keep the most accurate time possible. In order for your Casio G-Shock to display the correct atomic time, you must first set the watch to your time zone. Setting the time zone on your Casio G-Shock wrist watch is a simple task that can be completed by choosing the correct City Code for your particular time zone. You can correct the time zone for your Casio G-Shock in less than five minutes.

Step 1

Press and hold the top left button your Casio G-Shock wrist watch while in regular Timekeeping Mode.

Step 2

Wait for the City Code on the display to start flashing, indicating that you have entered the correct setting screen.

Step 3

Use the bottom right button on your Casio G-Shock to highlight the desired City Code for your time zone. Highlight "LAX" for Pacific time, "DEN" for Mountain time, "CHI" for Central time and "NYC" for Eastern time.

Step 4

Press the top right button on your Casio G-Shock wrist watch to select the correct and highlighted City Code for your time zone.

Step 5

Press the top left button on your Casio G-Shock wrist watch twice to exit the setting screen and return to regular Timekeeping Mode.


  • Set the time on your Casio G-Shock wrist watch manually when outside the range of the radio-controlled time transmission broadcast from Fort Collins, Colorado.


  • Casio G-Shock watches do not contain a time zone differential for Greenwich Mean Time. As a result, the watch's radio-controlled timekeeping feature will not display the correct time for Newfoundland, Canada.

About the Author

Megan Mattingly-Arthur has been writing professionally since 1998. She has contributed to various publications, including "Teen Voices" and "Positive Teens" magazines, as well as a book, "The Young Writer's Guide to Getting Published." Mattingly-Arthur is studying travel and tourism through Penn Foster Career School.