Assuming you would like a step-by-step guide on how to change the date on your G-Shock digital watch:
1. Locate the mode button on your watch. This is typically located on the lower left side of the face.
2. Press and hold down the mode button until the seconds begin flashing on the display. Once they start flashing, let go of the mode button.
3. Use the up or down arrow buttons to adjust the month and day until it reaches the correct date.
4. To move to setting the hour, press and hold down the mode button again until hours begin flashing on display. Adjust using up or down arrow buttons until it reaches desired time. 5 minute increments for minutes are typical for G-Shock watches, so scroll through those quickly using arrow keys if necessary before pressing mode button again to finalize time setting and return to normal watch face display.