Press the Mode (C) button to cycle through the settings in this order: Seconds → Hour → Minutes → Year → Month → Day.
While any digit is flashing, pressing the Top Right (B) button toggles between regular 12-hour and 24-hour (military) time formats. Casio G Shock Dw 6600 Instructions
You can activate a feature that flashes the screen backlight alongside the alarm or timer beeps. On the main timekeeping screen, press and hold the Start/Stop (D) button for about 2 seconds until the small flash icon appears on the display. Press the Mode (C) button to cycle through