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Several phone vendors post user manuals on-line. Dterm 80 is a phone that works on about 10 NEC phone systems. Find out which system you have; Pro II, Elite, IPK, IPK II, SV8100, 8300, 8500, and so on, then Google your system+user manual+PDF.
You need to do this from the Admin phones, by default the lowest ext #'s on the system. This is system programming not the phone itself. Refer to the Attendant guide for the phone system model your phones run on.
To reset time NEC Dterm 80
Press speaker and enter 728 on keypad.
Then enter correct time in 24 hour format...Ex. 2:56 = 1456
Then press speaker again...
Note: On my system this changes time on all phones on the system