Set the time and date
- In the Timekeeping Mode, hold A for at least two seconds and release it when the Home City name shows: the hands move out of the way.
- Press C until the setting you want flashes: Home City, summer time, seconds, hours, minutes, year, month, day, 12/24-hour timekeeping, and more.
- On the seconds, press D to reset them to 00.
- On the other settings, press B or D to change the value (hold for fast).
- Repeat the last steps for each setting you want to change, then press A to finish.
Good to know
Paired with a phone running CASIO WATCHES, the watch corrects its time about four times a day; setting it by hand is for when it cannot connect with a phone.
Resetting the seconds between 30 and 59 adds one minute.
To switch between 12-hour and 24-hour timekeeping, press C eight times after the Home City shows, then press D.
With no operation for about two or three minutes, the watch leaves the setting screen by itself.
From Casio's guide, page 12