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.
- Press C until the setting you want flashes: Home City, summer time, seconds, hours, minutes, year, month, day, 12/24-hour format, date format, day of week language, button tone, light duration, auto adjust, then Power Saving.
- On the seconds, press D to reset them to 00.
- On any other setting, press B or D to change it.
- Press A to leave the setting screen.
- For 12/24-hour format: open the settings as above, press C eight times until 12H or 24H flashes, press D to switch, then A.
Good to know
While paired with a phone running CASIO WATCHES, the watch sets its time from the phone by itself, four times a day. In the Timekeeping Mode, press D to connect and set the time now.
Resetting the seconds between 30 and 59 adds one minute.
Hold C for at least one second in any mode to go back to the Timekeeping Mode.
From Casio's guide, page 15