Planmeca Compact i5 User Manual page 218

26 Calibrating clock
208 Planmeca Compact i
14. Adjust the time to match the correct time by changing the hour, minute
and second values with the plus (+) and minus (-) buttons. When you
adjust the time, it is recommended that you check the correct time from
an NTP server.
15. Press OK to close the window.
The calibration can also be reset at this point, if you, for example, notice
that an error has been made during the calibration process.
User's manual