Casio GB-6900B User's Manual For Watch Functions page 23

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3
. U se.B.and.D.to.change.the.currently.selected.setting.as.described.below.
Screen
E-22
Time zone of the city where you will use the
watch
Summer time on/off
12-hour (12H)/24-hour (24H) timekeeping
switching
Seconds 00-reset
• From 30 to 59 seconds, resetting adds 1 to the
minute setting.
Hour and minutes settings
Year, month, day settings
Setting Operation
Use B and D.
Press D.
Press D.
Press D.
Use B and D.
Use B and D.