The basic steps to set the time on most G-Shock models

Most G-Shock watches use the same method: press the button labeled Mode until you reach the time-setting screen, then use the other buttons to adjust hours and minutes. The exact button sequence depends on your specific model — some use a button labeled Adjust, others use the up and down arrows — but the principle is the same across the line.

Before you start, know that G-Shock watches have different modes (time, alarm, stopwatch, world time). You need to enter the right mode first. On digital models, you'll see the current mode displayed at the top or bottom of the screen. On analog-digital hybrids, the digital display shows which mode you're in.

The time-setting screen usually blinks or highlights the part you're about to change — often the hour first, then the minutes. Once you've set both, pressing Mode again or holding a button will save your changes and exit the setting screen.

Key Takeaways

  • Press Mode repeatedly until the time display blinks or shows a setting indicator, which means you've entered time-set mode.
  • Use the up and down arrow buttons (or Adjust button) to change the hours first, then the minutes.
  • Your G-Shock model number determines the exact button layout, so checking your manual or the back of the watch saves trial and error.
  • If your watch has a world time or dual-time feature, make sure you're setting the home time, not a second time zone.

Finding your specific model's instructions

G-Shock makes hundreds of models, and not all of them follow the same button layout. The fastest way to find the right steps is to look at the back of your watch — the model number is printed there, usually starting with letters like DW, GA, GW, or GM.

Go to support.casio.com, search for your model number, and read the PDF manual. The manual will show you a diagram of your watch with each button labeled, plus the exact sequence for time-setting. This takes two minutes and beats guessing.

If you've lost the manual or can't find your model online, try searching "[your model number] time setting" on YouTube. G-Shock enthusiasts have posted videos for most common models, and watching someone do it is often clearer than reading instructions.

What to do if your watch won't hold the time

If you set the time correctly but it resets to the wrong time when you turn the watch off, or if it drifts and loses minutes over a few days, the battery may be low. G-Shock watches run for years on a single battery, but when the battery weakens, the watch sometimes can't hold settings.

Replace the battery first — you can do this yourself if you're comfortable opening the case back (usually four small screws), or take it to a watch repair shop or jeweler for about $10 to $20. After the battery is replaced, set the time again and it should stick.

If the time still won't hold after a fresh battery, the watch may have a hardware problem. At that point, contact Casio support or a repair shop, because the issue is likely inside the circuit board.

Syncing your G-Shock with your phone or computer

Some newer G-Shock models (particularly those with Bluetooth, marked as G-Shock Connected or with model numbers starting with GBD or GST) can sync time automatically with your phone through the G-Shock app. If your watch supports this, the app will set the time for you when you pair the watch to your phone.

To use this feature, read the G-Shock Connected app from your phone's app store, turn on Bluetooth on both your phone and watch, and follow the pairing steps in the app. Once paired, the app can update the time, set alarms, and change other settings without you touching the buttons.

If your G-Shock doesn't have Bluetooth, you'll need to set the time manually using the buttons. Older models and basic digital or analog-digital models don't have wireless connectivity.

Adjusting for daylight saving time

When daylight saving time begins or ends, you'll need to move your G-Shock forward or back one hour. Use the same Mode and button sequence you used to set the time initially — just change the hour by one.

If your watch has a world time feature with multiple time zones, check whether you're adjusting the home time or a secondary zone. Most G-Shock world time watches let you set which zone is "home" in the settings, so make sure you're changing the right one.

Some people set a second alarm or timer on their phone as a reminder to adjust their watch when the time change happens. This prevents you from accidentally running an hour off for weeks.

Resetting your watch if you get stuck

If you've pressed buttons and your watch is now showing the wrong time or won't exit the setting screen, don't panic. Most G-Shock watches have a reset function that clears all settings and returns the watch to factory defaults.

The reset button or sequence varies by model — some watches have a dedicated reset button on the back, others require you to hold Mode and another button for several seconds. Check your manual for the exact method, because pressing the wrong buttons won't help.

After a reset, your watch will show a default time (usually 12:00) and you'll need to set the time, date, and any alarms again from scratch. This is a last resort, but it always works if you're truly stuck.

Frequently Asked Questions

Why does my G-Shock keep losing time?

G-Shock watches are accurate to within a few seconds per month under normal conditions. If yours loses minutes or hours, the battery is likely weak. Replace it and the watch should keep time normally. If it still drifts after a new battery, the internal quartz oscillator may be damaged and the watch needs professional repair.

Can I set the time on a G-Shock without the manual?

Yes, but it takes longer. Press Mode until you see the time display blink or highlight, then use the arrow buttons to change hours and minutes. Most models follow this pattern. If you get stuck, search your model number on YouTube — someone has almost certainly posted a video showing the exact steps.

What if my G-Shock has both analog and digital displays?

Analog-digital G-Shock watches set both at once. When you enter time-set mode, the digital display will show which part you're adjusting (hour or minute), and the analog hands will move to match. Set the digital time and the hands follow automatically.

Do I need to remove my G-Shock to change the time?

No. You can set the time while wearing the watch. All the buttons are on the side of the case and straightforward to reach with your thumb. Some people find it easier to remove the watch and set it on a table so they can see the screen clearly, but it's not necessary.

Will changing the time damage my G-Shock?

No. Pressing the buttons to set the time is a normal function of the watch and won't harm it. G-Shock watches are designed to be adjusted repeatedly, and the buttons are built to last thousands of presses.