The time change can be made from any display telephone on the system. Enter the codes shown below with the handsets down (in its cradle). Always input the entire entry for the date and time entry including the minutes on the telephone keypad even though you may only be changing the hour!
PROSTAR 816
Enter programming mode by entering #04 followed by passcode of
4321 followed by 1#. The telephone will show the date and time again. Enter #55 and the display will show YY MM DD W HH MM. Enter the year for YY, the month for MM, the day for DD, the day of the week for W (Monday =1, Sunday=7), the hour in military time for HH, and the minutes for MM. Then enter #.
PROSTAR 816+
Enter #06 followed by passcode
of 4321 followed by 1# to enter programming mode. The telephone will show the date and time again. Enter #55 and the display will show YY MM DD W HH MM. Enter the year for YY, the month for MM, the day for DD, the day of the week for W (Monday =1, Sunday=7), the hour in military time for HH, and the minutes for MM. Then enter #.