I thought I had seen it all until this morning.
While my PC showed the date as Friday February 29, 2008 my Nortel 1140E phone showed the date as March 1, 2008 (actual display reads “CS1000 03/01 8:14AM”).
The time/date on the Nortel Call Server was correct along with the time/date on the Nortel Signaling Servers. This was one of the weirdest issues I had ever seen. We opened a ticket with our voice reseller and waited for a response. It wasn’t too long before we recieved a reponse from the reseller along with an PDF document from Nortel.
It seems Nortel has released a bulletin describing a problem with Leap year that affects all Nortel IP Phase 2 phones. Unfortunately there’s no solution other than waiting for March 1, 2008 to actually come around (tomorrow).