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

Updated on November 19, 2019
Edward Kirk profile image

I love my Casio G-Shock watch, but it took me a while to figure out how to change it to military time.

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 the 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 seldom 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 workday (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.

© 2010 Edward Kirk

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    • profile image

      Darlene 

      3 weeks ago

      Thank you!! I bought it as a gift for my boyfriend and he threw away the instructions, he gave me back the watch when he couldnt figure it out and said it didnt work!

    • profile image

      George Drewett 

      2 months ago

      How do I set iPhone time

    • profile image

      a random guy 

      2 months ago

      yea i did this and its stil not working.

    • profile image

      Sweep 

      5 months ago

      Nice work. Thanks!

    • profile image

      Michelle 

      5 months ago

      Thank you so much!

    • profile image

      Gary 

      9 months ago

      Dude I have dealing with problem for days I was ready to get a new one I can't believe I found you exact watch I have had it for years thanks man

    • profile image

      TickTockMan 

      10 months ago

      Thanks so much for posting this—I lost my instructions, and was going crazy, trying all the combinations I could think of. It never occurred to me that the center "G" button was useful for anything other than lighting up the display at night.

    • profile image

      Benjamin 

      11 months ago

      DID NOT WORK

    • profile image

      Me 

      15 months ago

      You must have had the good life to end the day at 1600!!

    • profile image

      me 

      20 months ago

      UR THE BEST

    • profile image

      margie 

      21 months ago

      thank you..

    • profile image

      Thatguy55 

      23 months ago

      Thanks a million. It didn't work on my dads 10-15 year old one, though.

    • profile image

      ahmet 

      2 years ago

      Thank you soo much

    • profile image

      Emily 

      2 years ago

      Thank you for your super helpful and clear instructions!

    • profile image

      Michael jones 

      2 years ago

      Thank you

    • profile image

      Eli_Pack 

      2 years 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 

      2 years ago

      Thank u soo much!!

    • profile image

      Neel 

      2 years ago

      It helped

    • profile image

      Thimon 

      2 years ago

      It freaking work

    • profile image

      Lerish 

      2 years ago

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

    • profile image

      emily 

      3 years 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 

      3 years 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 

      4 years ago

      Thanks. So easy.

    • profile image

      carlos 

      4 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 

      4 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 

      5 years ago

      Thank you so much! This was too useful.

    • profile image

      Bree 

      5 years ago

      Yay!!!!

    • profile image

      Joel 

      5 years ago

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

    • profile image

      qwwr 

      5 years ago

      thx did the reverse though :)

    • profile image

      fk11 

      6 years ago

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

    • profile image

      sherodh251 

      6 years ago

      Adjust then the G

    • profile image

      balanga 

      6 years ago

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

    • profile image

      Mixan 

      6 years ago

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

    • profile image

      mh 

      6 years ago

      Thx you so much

    • profile image

      Ec 

      6 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 

      7 years ago

      You rock! Thanks...

    • profile image

      Mickey 

      7 years ago

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

    • profile image

      altan 

      7 years ago

      very thank you

    • profile image

      Curtis 

      7 years ago

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

    • profile image

      Erick 

      7 years ago

      Thanks C:

    • profile image

      G-Shock man 

      7 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 

      8 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 

      8 years ago

      OMG THANK YOU!!!

    • profile image

      hollybush inn 

      8 years ago

      spot on cheers. it was doing me nut

    • profile image

      MR.Marchai 

      8 years ago

      thanks hab

    • profile image

      chaka 

      8 years ago

      it was really easy

    • profile image

      give your g-shock now! 

      8 years ago

      thank-you

    • profile image

      John Tayao 

      8 years ago

      thanks!!!! it worked!

    • profile image

      Casio watches 

      8 years ago

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

    • profile image

      lucallen 

      8 years ago

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

    • profile image

      jmp 

      8 years ago

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

    • profile image

      curtis 

      8 years ago

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

    • profile image

      ivan 

      8 years ago

      thanks!

    • profile image

      Stef 

      8 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 

      8 years ago

      PRESS ADJUST THEN PRESS THE LIGHT IT TURNS 12HOUR MODE

    • profile image

      logan 

      8 years ago

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

    • profile image

      Ric 

      8 years ago

      thanx!!!!!....

    • profile image

      Bizzkid 

      8 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 

      8 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 

      8 years ago

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

    • profile image

      stev 

      8 years ago

      this helped so much, thank you

    • profile image

      gazza 

      8 years ago

      thanks heaps!!!

    • profile image

      hab 

      8 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 

      8 years ago

      Cheers thank you

    • profile image

      milton 

      8 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

      8 years ago

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

    • profile image

      cihs 

      8 years ago

      very helpfull :)

    • profile image

      Moto 

      8 years ago

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

    • profile image

      chris 

      9 years ago

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

      i love technology!

    • Edward Kirk profile imageAUTHOR

      Edward Kirk 

      9 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 

      9 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 

      9 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 

      9 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 

      9 years ago

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

    • profile image

      maiky payano 

      9 years ago

      thanks a lot :] very helpful

    • Edward Kirk profile imageAUTHOR

      Edward Kirk 

      9 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 

      9 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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