How to Change a G-Shock Between 12-Hour and 24-Hour Military Time

Updated on March 15, 2017

Instructions to Change a Casio G-Shock Watch Between 12-Hour and 24-Hour Military Time

  1. Locate each of the 5 watch buttons. In clock face position, they are located at 2 o’clock, 4 o’clock, 6 o’clock, 8 o’clock, and 10 o’clock.
  2. Push the button at 10 o'clock. This makes the second digits blink.
  3. Then push the button at 6 o'clock. Presto! The hour digits change from civilian time to military time, or vice versa.
  4. Press the button at 10 o'clock again to stop the second digits from blinking. If it is earlier than 1:00 pm, you won't be able to tell the difference between the civilian and military format by looking at the digits. To know whether you are in military format, a "24" will be displayed.

An old Casio G-shock Watch
An old Casio G-shock Watch

How I Figured It Out

Somehow, my watch changed from civilian 12-hour time format to the 24-hour military format. Since the watch was little used, I put up with the inconvenience. It was an inconvenience because the only military time I really knew was 16:00 (4 o’clock). I remember 16:00 from my very brief experience with the military. This time signaled the end of the work day (the most important time of the day). When the formatting on my watch changed, I had to base all of my time-telling from 16:00. It sort of worked, but was becoming a pain.

So I went to the fount of all information — the Internet — but I could not find the answer. Finally, I decided to dig out the easy-to-follow directions that came with the watch. I am sharing this wonderful piece of information with you just in case you've lost the instructions.

Questions & Answers

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      • profile image

        ahmet 

        3 weeks ago

        Thank you soo much

      • profile image

        Emily 

        3 months ago

        Thank you for your super helpful and clear instructions!

      • profile image

        Michael jones 

        3 months ago

        Thank you

      • profile image

        Eli_Pack 

        4 months ago

        Thank you SO much! Mom bought mine used also, and was driving us both crazy;happened when springing forward a hour lol. The instructions were very clear;after mom figured out the 6 button was the light lol

        Thanks again

      • profile image

        Jayy_Bruhh 

        5 months ago

        Thank u soo much!!

      • profile image

        Neel 

        8 months ago

        It helped

      • profile image

        Thimon 

        8 months ago

        It freaking work

      • profile image

        Lerish 

        10 months ago

        Oh wow it was super easy...was bothered for a while with this. thanks for the solution.

      • profile image

        emily 

        18 months ago

        got this new watch and i tried alot of things and it is still on the military time): what do i do

      • profile image

        MC 

        20 months ago

        So helpful! This has been driving me crazy for years, as I could never figure out how to change it out of military time (not sure how it got that way in the first place). Of course, I never thought to push the light button, though I tried everything else a million times!

      • profile image

        Columbus 

        23 months ago

        Thanks. So easy.

      • profile image

        yo mama 

        2 years ago

        OH MY GOD! THIS WHOLE TIME AND IT WAS THAT DAMN SIMPLE...!

      • profile image

        carlos 

        2 years ago

        Thanks i forgot about pressing the 6 button i had this watch for over a decade we been in 45 states 3 continents 11 countries on foot on 2,4,8 and 18 wheels days and nights in dirt crud mud fog blood snow in the water in the woods in the mountains and the desert ill keep it till it dies

      • profile image

        Derick 

        2 years ago

        Thanks so much!... Now, my daughter can use the military time she always wanted since the day I bought her first G-Shock...

      • profile image

        Ernie 

        3 years ago

        Thank you so much! This was too useful.

      • profile image

        Bree 

        3 years ago

        Yay!!!!

      • profile image

        Joel 

        3 years ago

        Thanks helped a lot, couldn't remember how to put it back to military time

      • profile image

        qwwr 

        3 years ago

        thx did the reverse though :)

      • profile image

        fk11 

        4 years ago

        anybody know how to adjust time and date for GD-100 Gshock model? thanks

      • profile image

        sherodh251 

        4 years ago

        Adjust then the G

      • profile image

        balanga 

        4 years ago

        TNX!!! I hate the 12-hour conditin, and you helped me getting rid of it.

      • profile image

        Mixan 

        4 years ago

        Thank you very much for the helpful guide..Nice..!!

      • profile image

        mh 

        4 years ago

        Thx you so much

      • profile image

        Ec 

        4 years ago

        For newer g shocks i find that if you press adjust until my date starts blinking then press mode until 24 hr time show up then press start and magic it works. Or the 12 hr time to 24 hr time doesn't matter.

      • profile image

        AJ 

        5 years ago

        You rock! Thanks...

      • profile image

        Mickey 

        5 years ago

        The most simple thing to adjust and hardest thing to find info on. Thanks so much.

      • profile image

        altan 

        5 years ago

        very thank you

      • profile image

        Curtis 

        5 years ago

        Thanks. I am in the military and used your instructions, but in reverse. Very easy and helpful.

      • profile image

        Erick 

        5 years ago

        Thanks C:

      • profile image

        G-Shock man 

        5 years ago

        changed the battery and it switched the hour format. took less than 30 seconds to find this site and find out how to fix it. thanks a lot!

      • profile image

        Lisa 

        5 years ago

        OMG, who would have guessed the light button?! I tried every combo and have been living with military time for about 3 years. Thanks a million!

      • profile image

        dandan 

        6 years ago

        OMG THANK YOU!!!

      • profile image

        hollybush inn 

        6 years ago

        spot on cheers. it was doing me nut

      • profile image

        MR.Marchai 

        6 years ago

        thanks hab

      • profile image

        chaka 

        6 years ago

        it was really easy

      • profile image

        give your g-shock now! 

        6 years ago

        thank-you

      • profile image

        John Tayao 

        6 years ago

        thanks!!!! it worked!

      • profile image

        Casio watches 

        6 years ago

        Excellent blog so be sure to continue! That helped me a lot i just trying for a few months....

      • profile image

        lucallen 

        6 years ago

        mine's been that way for a few months. i just quit trying... thanks for the help!

      • profile image

        jmp 

        6 years ago

        thanks only took a sec. to change been trying for an hour or so. lol.

      • profile image

        curtis 

        6 years ago

        been trying to figure that out for a few days.. thanks!

      • profile image

        ivan 

        6 years ago

        thanks!

      • profile image

        Stef 

        6 years ago

        This works i was wondering how to change back my watch but tanx to this i finnally got it changed

      • profile image

        CUATRUS 

        6 years ago

        PRESS ADJUST THEN PRESS THE LIGHT IT TURNS 12HOUR MODE

      • profile image

        logan 

        6 years ago

        Wow that worked thanks been trying to find out how to do it

      • profile image

        Ric 

        6 years ago

        thanx!!!!!....

      • profile image

        Bizzkid 

        6 years ago

        This was drivin me nuts thanks for the help. Tried everything, but the light button. You couldn't have made it any easyier. thanks again!

      • profile image

        Sean 

        6 years ago

        None of the above worked for me, i have a GR-8900A-1

        For this model you have to hold down the 10 o'clock

        until the words start to flash, press the 8 o'clock, followed by the 4 o'clock.

      • profile image

        baggedgmc 

        6 years ago

        Wow thanks for that trick buddy. . . P.s. bagged out trucks rule (rokbottomtrux.com

      • profile image

        stev 

        6 years ago

        this helped so much, thank you

      • profile image

        gazza 

        6 years ago

        thanks heaps!!!

      • profile image

        hab 

        6 years ago

        if you have a new version of the g shock and you want to change it from 12hr mode to 24 hr mode just press the 4 o clock button and it fixes it

        http://www2.casio.co.jp/manual_pdf/wat/en/pdf_sear...

      • profile image

        howie 

        6 years ago

        Cheers thank you

      • profile image

        milton 

        6 years ago

        Thanx a lot I've been wanting to switch my G-shock into military time for a while and thanx to u and to google for they're "search" thingy I found this.. thanx again..

      • profile image

        6 years ago

        I pushed every button in as many different ways possible....except the light button...thx!!!

      • profile image

        cihs 

        6 years ago

        very helpfull :)

      • profile image

        Moto 

        6 years ago

        Great help! works on 16 year old G-shock :)

      • profile image

        chris 

        6 years ago

        thank ****** this is the first thing i find! awesome!

        i love technology!

      • Edward Kirk profile imageAUTHOR

        Edward Kirk 

        7 years ago from Maryland

        I really do not want to give you this answer but I must. Some of the newer models of G-Shock watch require a different combination of buttons; refer to your manual for the exact procedure. If the manual is not available go to the Casio web site and follow the daisy chain to get a PDF for your exact watch manual. You will need the module number from the back of the watch.

      • profile image

        David 

        7 years ago

        I have the exact same problem with my brand new g shock. I held down the 10 o'clock button until the seconds started blinking then held down the light button at 6 o'clock and nothing happened, the face of the watch just lit up. Any help?

      • profile image

        Rick 

        7 years ago

        yes that was great, instead of the dumbasses that tell you to look at the manual........if I still had it twenty years later I would have morons........again thanx

      • profile image

        Sasha 

        7 years ago

        god bless you, same story, same problem, thx a lot (by the way, my G-Shocks works since more than 13 years, amazing)

      • profile image

        ray 

        7 years ago

        thanks this really helped...!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

      • profile image

        maiky payano 

        7 years ago

        thanks a lot :] very helpful

      • Edward Kirk profile imageAUTHOR

        Edward Kirk 

        7 years ago from Maryland

        Do what I say. Push the 10 o'clock button then 6 o'clock (yes the light button) that was the secret to the whole thing.

      • profile image

        madison 

        7 years ago

        hey i am having the same problem but the botton at six o clock is the light button, some clarification please.

        just email me

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