AT&T Partner:

1. Press FEATURE, 0, 0, SYSTEM PROGRAM, SYSTEM PROGRAM, #, 1, 0, 3, at extension 10 or 11.
2. Enter a new time in 24-hour notation. For example, to set the time to 2:15 P.M., press 1415. A display similar to the following appears:

-System Time

-Data 1415

-This time appears on system display phones as 2:15 P.M.

3. Select another procedure or exit programming mode.