Avaya (ACS, Partner, Partner II)
All programming is done at extension (or intercom) numbers 10 or 11. Keep
handset down and: 
1.  Press feature key, then 00 (enters programming mode)
2.  Press left intercom button twice
3.  #103 (code to change system time)
4.  Enter correct time (military time)
5.  Press feature key, then 00 (exit programming)