How do I get it back in 12 hour mode?

SOURCE: athletic wrist watch stuck in 24 hour mode

Maddening, isn't it? Fortunately the solution is here:

http://www.ehow.com/how_5593310_set-athletic-works-watch.html

1 There should be four buttons: mode, reset, start and light. Find the mode button and press it three times until it is in the set time mode.

2 Find the reset button, which usually is located on the bottom right side of the watch face, and hold it until the time starts blinking.

3 Press the start button to change minutes.

4 Press the reset button again to switch to hours.You will know it worked when the hour starts blinking instead of the minutes.

5 Press the start button to change the hour. The watch can handle two modes: standard and military. As you press start, the hour will change from AM to PM, noted by an "A" or a "P" in the top right. When you get through 24 hours, the watch will change to military time and an "H" will be displayed instead of "A" or "P." Keep pressing start to go through another 24-hour cycle and it will revert back to standard time.

SOURCE: How do I get my Timex WR50M watch out of the 24 hour (military) time and back to a 12 hour clock?

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.

SOURCE: 24 hour time setting to 12 hour

You can't! Trust me I have been dealing with watches for 2 years now and currently work in the industry as a watchmaker's assistant.

There are different settings for each different brand, Casio have there own configure and so does Seiko etc.

Best way I know is to push buttons to something happens. Please note DO NOT DEPRESSED ALL PUSHERS AT ONCE, this 99.99% of the time will reset the entire device!.

Usually there is a 'reset' pusher which will once depressed (either immediately or after a few seconds of pushing it) will flash, then you work out which one is the 'next' button until you get to the 12/24hr then press the Up or down pusher (usually but NOT always opposite side to the 2 previously menitioned pushers).

As for auto's or quartz that's another matter.

Hope this helps?

SOURCE: how to change from 24 hour to 12 hour on g shock

http://world.casio.com/wat/download/en/manual/


Use the four numbers on the back of your watch and you will have a PDF version of your instruction manual.

Hope this tip helps

R/

David

SOURCE: cannot change from 24 hour to 12 hour

To change from 24 hour to 12 hour, you hold down the "Mode" button until it switches from 24 hour to 12 hour or vice versa. To change the time zone, you hold down the "Set" button until the time zone that you set it in flashes (like "LAX" on my watch). Then you press the "Receive/Start/Stop" button to choose the specified time zone you want. To set for daylight savings time ("DST" on the watch), after holding the "Set" button and having the time zone flash, you could press the "Mode" button. It will give you a few options for the daylight savings time (Auto, On, or Off). I chose the "On" option, which immediately changed for daylight savings time. If you manually want to change the time, you could hold down the "Set" button and keep pressing the "Mode" button until the time starts flashing on your watch, then pressing the "Receive/Start/Stop" button until you change it to the time that you want. You could also set the watch to beep or chime after pressing the set button if you wanted to know that piece. You hold down the "Set" button when you are done to get it to stop flashing. These instructions worked for my Timex T5G341 Universal Radio Control Watch. I hope this helps.