G-Shock GW-1800DJ-1A9 - Manual (Page 42)

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3. When the setting you want to change is flashing, use B and/or D to change it as
described below.
Screen: To do this:
Change the city code
Cycle between Daylight Saving Time
(
), Standard Time ( ), and Auto
DST ( )
Toggle between 12-hour (
12H ) and
24-hour ( 24H ) timekeeping
Do this:
Use D (east) and B (west).
Press D.
Press D.
Seconds Hour
12/24-Hour
Format
Minutes Year
DST
Day Month
City Code
Power
Saving