How to change a perpetual calendar from a constellation calendar to an ordinary calendar?

1. The button for adjusting the calendar time is on the back. First, turn it over, and then click the double arrow button of the calendar.

2. When you press it once, the year number of the electronic clock will start flashing, then press the modify button to modify it according to the date, and then press it again, it will be the turn of the month number to flash and modify it in the same way.

3. Press the "Reset" button after adjustment.