NEC DS 1000 and 2000
1. Go to extension 300. (Usually the reception phone.
    Press 6 on any idle telephone and the extension number will appear in the display).
2. Press #TD (#83) for Time/Date.
3. Current time will appear in the display.
    Enter time in 24-hour clock using the following format:
    (HHMMSS) Hours (2 digits), Minutes (2 digits) and Seconds (2 digits)
4. Press HOLD
5. Current date will appear in the display.
    If the date is correct you may press HOLD then SPK to exit programming OR
    Enter date using the following format:
    (MMDDYYYY) Month (2 digits), Day (2 digits) and Year (4 digits)
6. Press HOLD then SPK.