Introduction - If you have any usage issues, please Google them yourself
Make a liquid crystal clock with 1602, the first line shows the year - month - day, the second line display - - minutes - seconds;
Press the button on the matrix keyboard, K1, when the clock stops,
K1 press, move the cursor to seconds, and move two to ten seconds...... The cursor moves with time, minutes, seconds, years, months, days,
Press K2, K3 to increase, and reduce the number of changes to the cursor's location;
Press K4 to start the clock.