Depending on the model of your watch, display text appears •
either as dark ﬁgures on a light background or light ﬁgures
on a dark background. All sample displays in this manual are
shown using dark ﬁgures on a light background.
Button operations are indicated using the letters shown •
in the illustration.
Each section of this manual provides you with the •
information you need to perform operations in each
mode. Further details and technical information can be
found in the “Reference” section.
Graphic area A
Graphic area B
Auto light switch on indicator
Flash Alert on indicator
Hourly time signal on indicator
Alarm on indicator
Press •C to change from mode to mode.
In any mode (except when a setting screen is on the display), press B to illuminate
Timekeeping ModeWorld Time ModeAlarm ModeStopwatch Mode
The Timekeeping Mode’s Multi Time feature gives you
quick and easy access to the current time and date in
four different cities, numbered from T-1 (Time 1) through
T-4 (Time 4). T-1 is your Home City Time, and T-2,
T-3, and T-4 are Local Times. Local Times are kept in
synchronization with your Home City Time (T-1).
Day of week
Hour : Minutes Seconds
Month – Day
Switching Between Time Screens
Each press of D cycles the time screens in the sequence shown below.
Displayed for one second
While the Home City Time (T-1) screen is displayed, pressing •A will switch the day
of the week / month-day indication to the currently selected Home City code and the
T-1 indicator for about one second.
You can change the current time setting for your Home City Time (T-1) only. •
For Local Times (T-2, T-3, T-4), you only can change the city code and DST setting. •
Scrolling through the Time Screens
In the Timekeeping Mode, holding down •D for about three seconds will cycle the
time screens in sequence, from T-1 through T-4.
Pressing any button will display the Home City Time (T-1) screen. •
Changing the Current Home City Time and Date Settings
Use 1. D to display the current Home City Time (T-1)
Hold down 2. A until the seconds start to ﬂash, which
indicates the setting screen.
Press 3. C to move the ﬂashing in the sequence shown
below to select other settings.
When the setting you want to change is ﬂashing, use 4. D and B to change it as
ScreenTo do this:Do this:
Reset the seconds to .
Toggle between Daylight Saving Time ()
and Standard Time ().
Change the city code.
Use D (east) and B (west).
Change the hour or minutes.
Use D (+) and B (–).
Toggle between 12-hour () and 24-hour
Change the year.
Use D (+) and B (–).
Change the month or day.
Toggle the setting between 1.5 seconds ()
and 3 seconds ().
Toggle between Flash Alert on () and
See “Daylight Saving Time (DST)” for details about DST setting. •
For information about Flash Alert, see “Flash Alert”. •
Press 5. A to exit the setting screen.
The day of the week is displayed automatically in accordance with the date (year, •
month, and day) settings.
Daylight Saving Time (DST)
Daylight Saving Time (summer time) advances the time setting by one hour from
Standard Time. Remember that not all countries or even local areas use Daylight
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View the manual for the Casio GD-100GB-1 here, for free. This user manual comes under the category Watches and has been rated by 2 people with an average of a 9.1. This manual is available in the following languages: English. Do you have a question about the Casio GD-100GB-1? Ask your question here
Below, you will find the most frequently asked questions about the Casio GD-100GB-1.
A battery in my Watch has started to corrode. Is the device still safe to use?
The product can still be used safely after proper cleaning. Remove the battery with gloves and clean the battery compartment with a toothbrush and vinegar. After drying, new batteries can be inserted into the device.
Is the manual of the Casio GD-100GB-1 available in English?
Unfortunately, we do not have the manual for the Casio GD-100GB-1 available in English. This manual is available in English.