CASIO G-Shock Watch Change between 12 hour and 24 Hour format. Military Time Set Hour Format

An Old Casio G-Shock Watch

The Information

Somehow my watch was 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 1600 (4 o’clock). 1600 was learned during my very brief experience with the military. 1600 was the end of the work day and certainly the most important time of the day and I had to base all other military time from 1600. It did sort of work.

But it was becoming a pain, so off to the fount of all information, the Internet, and guess what? The answer was not found. I had to dig out the easy to follow directions that came with the watch. I am now going share this wonderful piece of information with you and add to the knowledge base of the Internet.

THE PROCEDURE: Consider each of the 5 watch buttons is located at a clock face position (2 o’clock, 4 o’clock, 6 o’clock, 8 o’clock and 10 o’clock). Push the button at 10 o-clock this starts the second’s digits on the watch to blink. Then push the button at 6 o-clock and presto the hour digits change from civilian time to military or vice versa. Press the button at 10 o'clock again to stop the seconds from blinking. If it is earlier than 1:00 pm the digits civilian/military will look very similar, but a '24" will be displayed if in military time.

If I can be of further help let me know.

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Comments 61 comments

madison 6 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

Edward Kirk profile image

Edward Kirk 6 years ago from Maryland Author

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.

maiky payano 6 years ago

thanks a lot :] very helpful

ray 5 years ago

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

Sasha 5 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)

Rick 5 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

David 5 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?

Edward Kirk profile image

Edward Kirk 5 years ago from Maryland Author

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.

blacking 5 years ago

tx tx txt xtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxtxt a lot

jeo 5 years ago

finally so easy smh bin lookin for the answer for dayssss thanx verry helpfulll!!!!!!

chris 5 years ago

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

i love technology!

Moto 5 years ago

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

cihs 5 years ago

very helpfull :)

5 years ago

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

milton 5 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..

howie 5 years ago

Cheers thank you

hab 5 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

gazza 5 years ago

thanks heaps!!!

stev 5 years ago

this helped so much, thank you

baggedgmc 5 years ago

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

Sean 5 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.

Bizzkid 5 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!

Ric 5 years ago


logan 5 years ago

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

CUATRUS 5 years ago


Stef 5 years ago

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

ivan 5 years ago


curtis 4 years ago

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

jmp 4 years ago

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

lucallen 4 years ago

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

Casio watches 4 years ago

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

John Tayao 4 years ago

thanks!!!! it worked!

give your g-shock now! 4 years ago


chaka 4 years ago

it was really easy

MR.Marchai 4 years ago

thanks hab

hollybush inn 4 years ago

spot on cheers. it was doing me nut

dandan 4 years ago


Lisa 4 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!

G-Shock man 4 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!

Erick 4 years ago

Thanks C:

Curtis 4 years ago

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

altan 4 years ago

very thank you

Mickey 3 years ago

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

AJ 3 years ago

You rock! Thanks...

Ec 3 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.

mh 2 years ago

Thx you so much

Mixan 2 years ago

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

balanga 2 years ago

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

sherodh251 2 years ago

Adjust then the G

fk11 2 years ago

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

qwwr 2 years ago

thx did the reverse though :)

Joel 2 years ago

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

Bree 23 months ago


Ernie 22 months ago

Thank you so much! This was too useful.

Derick 18 months ago

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

carlos 16 months 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

yo mama 10 months ago


Columbus 6 months ago

Thanks. So easy.

MC 3 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!

emily 4 weeks ago

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

zaton profile image

zaton 2 weeks ago from California

G-Shock is definitely a reputable watch and every man should own one. I have a G-Shock, a timex, a hamilton, and an Invicta Venome watch that really impresses because of its size.

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