I have a g7900 gshock watch. on the little manual says toggle 24 hour/12 hour i have to press button D, but it didnt work out. i want my time to be on 12 hour format. please help me with the steps.. thank u mch.

To set time and date, you must in "Time Keeping Mode" (display day, date & time) then press and hold the left-up button until it start flashing. To set press right-down button, to go next setting press left-down button.

To toggle between 12-hour to 24-hour, again, must in "Time Keeping Mode" then press right-down button.

here is the manual https://support.casio.com/storage/en/manual/pdf/EN/009/qw2672.pdf

To Toggle between 12-hour and 24-hour timekeeping:

In the Timekeeping Mode (regular watch display), press the lower right-hand button to toggle between 12 and 24 hour timekeeping.

To set the hour format, press S1 button
to toggle between 12-hour and 24-hour
format. The P.M. indicator may be
displayed to indicate the time period
12:00 A.M. - 11:59 P.M. in 12-hour
format.
11.To set the calendar format, press S1
button to toggle between M-D (monthdate)
and D-M (date-month) format.
12.After finished making all the settings,
press S2 button to confirm...

I just got a M.Z. Berger AW206 366 so the setup should be identical.
The watch has four buttons total. I'll name then by their positions. Top Left (TL), Top Right (TR), Bottom Left (BL), and Bottom Right (BR).
(BL) is your mode switch. Press it once at a time to toggle between modes, (Time, Chronograph, and Alarm). From the Time mode press (BL) three times. This will put you back in time mode with the seconds flashing. Press (TR) to toggle seconds back to '00'. Press (BR) to toggle to the next setting point, and (TR) to advance it. Just keep pressing (BR) until all the settings points are the way you want them. Note: In time setting mode it only advances the setting forward when you press (TR). So when using it to change hours display for 12/24 hour display or daylight savings time you just have to keep advancing the hour until it shows up correct. There is no DST or 12/24 display toggle on this watch. You just have to change the hours display manually. To exit time setting just press (BL) once.

Depress and hold down the spl/reset button. Pressing the mode button will now switch you back and forth from 24 hour time
.download manual from link below
http://www.gshock.com/support/

To change your Armitron WR165 watch from military time (also known as 24-hour time) to 12-hour time, you will need to follow these steps:

1. Press and hold the "mode" button until the display shows the current time format (either 12H or 24H).
2. Press the "set" button to toggle between the two time formats.
3. When the desired time format is displayed, press the "mode" button to exit the setting mode and save the new time format.

If you are having trouble changing the time format on your watch, you may want to consult the user manual for your specific model, as the steps may vary slightly depending on the version of the watch you have. You can also try contacting Armitron customer support for further assistance.

Hi Harry,

Your Module number is 2271.
1. To set the time, press and hold button A (left top) until Seconds digits start to flash.
2. Press button D (lower left) to move flashing in the following sequence to change other setting:
Seconds >> Hour >> Minutes >> 12/24 Hour Format >> Year >> Month >> Day >> (Then back to Seconds)
3. While a setting is flashing, use E (+) (bottom right) and B (-) (top right) to change it.
Note: When in the 12/24 Hour Mode, use E and B to toggle between 12-Hour and 24-Hour Mode.
4. Press buton A to exit setting screen.
Your time should now be set.

You may also download a manual for watch/Module number:
http://pathfinder.casio.com/resource/manuals/module_2271.pdf

This should give you all the info you need to operate all the functions of your watch. Thanks.

Regards, Bill

On the Casio 2747 you can easily change between 12-hour and 24-hour (i.e. Military time)... Follow these steps:

1. Make sure you are in Timekeeping Mode (i.e. digital display shows date at the bottom).
2. Press the "D" button (i.e. bottom-right button) to toggle between 12-hour and 24-hour timekeeping.

Note: 12-hour timekeeping mode will display an "A" or "P" for AM and PM.

Press and hold the SET button (it will read CHIME with a flashing on or off). Then push the MODE button - the top will be flashing 12-HR or 24-HR. Push the ST/SP button to toggle between the 12-HR to 24-HR reading. Push the MODE button to get to the hour/minute/second/year/mo-day/month/day value you want to change. Push the ST/SP button to increase the value, the RESET button to reduce the value.

Hold down the adjust button bottom right then press the mode button top left you will notice the a or p that stands for am/pm will disappear & reappear. If you have an a or p on your display then you are out of military time.