Quick answer: Press Mode until the seconds are running. Hold Adjust for two to three seconds until the seconds flash. Press Mode to move between fields. Press the lower-right button to change the flashing value. Press Adjust once more to save.
That sequence covers most Casio digital watches. The rest of this guide covers the exceptions, the analog-digital models, and what to do when nothing happens.
Step 1: Find your module number
Turn the watch over.
Printed on the case back is a three or four digit number, usually below or beside the model name. Common ones are 3299, 3240, 3198 and 593.
This number identifies the software inside your watch, not the design. Casio publishes a manual for every module at support.casio.com. Search your number there and you get the exact button sequence for your watch, free.
Write it down before you start. It is the most useful thing you own when something goes wrong three years from now.
Step 2: Learn the four buttons
Most Casio digital watches use the same layout.
|
Button |
Usual label |
What it does |
|---|---|---|
|
Top left |
Adjust |
Hold to enter and exit setting mode |
|
Bottom left |
Mode |
Cycles between modes, and moves between fields while setting |
|
Top right |
Light |
Illuminates the display, or starts the stopwatch |
|
Bottom right |
Reverse or Search |
Changes the value that is flashing |
Three-button models such as the F-91W work the same way with one fewer button: one to enter setting, one to move, one to change.
Step 3: Set the time
-
Press Mode until the display shows normal timekeeping with the seconds counting.
-
Hold Adjust for two to three seconds. The seconds start flashing.
-
Press the bottom-right button to zero the seconds. Do this exactly on the minute if you want the watch perfectly set.
-
Press Mode to move to the next field. The usual order is seconds, hour, minutes, year, month, day.
-
Press the bottom-right button to change whatever is flashing. Hold it to scroll faster.
-
Press Adjust once to save and exit.
If a 12H or 24H indicator flashes at the start of the sequence, the bottom-right button switches between formats.
Step 4: Set the date
The date lives inside the same sequence. Keep pressing Mode past the minutes and you reach year, month and day in turn.
If the date appears in an order you do not want, check your module manual. Some modules let you change the format; others display it in a fixed order.
Analog-digital models need one extra step
Watches with both hands and a digital display set the hands separately from the digital time. This applies to the AQ-230 and AQ-240 in the Vintage range, and to the GA series in G-Shock.
The procedure is usually called hand adjustment, or H-Set. You hold Adjust until the watch enters hand-setting mode, then move the hands with the right-hand buttons until they match the digital time.
This is the step most people skip. It is why a watch can show the right digital time with the hands pointing somewhere else entirely.
When nothing happens
|
Symptom |
Likely cause |
Fix |
|---|---|---|
|
Holding Adjust does nothing |
Watch is not in timekeeping mode |
Press Mode until the seconds are running, then retry |
|
Setting mode opens, then closes |
Button not held long enough |
Hold for five seconds on some modules |
|
Setting will not save |
Low battery |
Check whether the display is also dim |
|
Display is blank or faint |
Flat battery |
Replace the cell, and the gasket with it |
Still stuck?
If the module number has worn off the case back, or the watch will not hold a setting after a battery change, send a photo of the case back to casio@brands-wa.com or call +233 542 344999. The Brandswa Casio team at Achimota Mall, Accra can identify the module.
If you have just bought a G-Shock, our separate guide covers the 5081 module setup in full.
Frequently asked questions
How do I set the time on a Casio digital watch?
Press Mode until you are in timekeeping, hold Adjust until the seconds flash, use Mode to move between fields and the lower-right button to change values, then press Adjust to save.
Where is the module number on a Casio watch?
On the case back, as a three or four digit number. It tells you which official Casio manual applies to your watch.
Why are the hands wrong on my analog-digital Casio?
The hands are set separately from the digital display. Use the hand adjustment mode in your module manual to line them up.
How do I switch a Casio from 12-hour to 24-hour?
Enter time setting and press the lower-right button while the 12H or 24H indicator flashes. It is usually the first field in the sequence.
My Casio will not let me change the time. Why?
Usually the watch is not in timekeeping mode, or Adjust is not being held long enough. If the display is dim as well, suspect a flat battery.