How does the calculator set the time and date?

The calculator sets the time and date as follows

Press the time and date button to switch to the year, month and day interface. Click the set button, and the year number will start flashing. Press the up or down button to adjust to the year you need.

Press the set button and the month will start flashing. The method is as above. After adjusting the year, month and day, click the time and date button again to start adjusting the hours, minutes and seconds. The method is as above.