I want to save you money and time of a service call.  My old employer would send us out when a customer needed a time change.  It cost them a two-hour minimum and I was only there 15 minutes.  If you need help here are the steps…

Nortel Norstar Telephone Systems

Changing the time on a Norstar system must be done using a display phone. Using a M7310 or T7316 the right 2 buttons under the display are “NEXT” and “SHOW” respectively.

1. To enter programming mode press “FEATURE” and “* * 2 6 6 3 4 4″
2. Enter password (default = 266344) - display should read “Terminals & Sets”
3. Press “NEXT” 5 times - display should read “Time and Date”
4. Press “SHOW” - display should read “Hour:___”
5. Press softkey “CHANGE”
6. Enter hour - display should read “AM OK or Change”
7. Select AM or PM
8. Press “NEXT” - display should read “Minutes:___”
9. Press softkey “CHANGE”
10. Enter minutes
11. Press “NEXT” - display should read “Year:___”
12. Press softkey “CHANGE”
13. Enter year
14. Press “NEXT” - display should read “Month:___”
15. Press softkey “CHANGE”
16. Enter month
17. Press “NEXT” - display should read “Day:___”
18. Press softkey “CHANGE”
19. Enter day
20. Press “NEXT”