Generally, the digital calendar adjuster has four keys, namely: exit, running water (downward adjustment), upward adjustment and setting.
Press the "Set" key first (when the time is set and the year flashes, you can press the "Up" or "Running Water (Down)" key to modify the year. After modification, press the "Set" key to switch the flashing to the Gregorian calendar month, and press the "Up" or "Down" key to modify the month; Day, hour, minute and second can be set in the same way;
Week, lunar month and day will change automatically with the change of Gregorian calendar.
Second, press the "Set" or "Exit" key to exit the time setting and return to the normal time state.
I hope my answer can help you.