Unfortunately it's a national grocery chain, which means any decisions about replacing equipment have to come from elsewhere. Never thought of maybe having an issue with the dates, so I'll suggest trying 1998 to the manager next time I talk to him.
Ideally it'll get replaced at some point, but I don't envy anyone it. No way to back it up, programming records from 20 years ago I'm sure have been lost. I don't recall whether they've got a voicemail or not. I'm thinking not, maybe a basic system for AA.

Ex-Norstar, ex-Definity, current NEC/Zultys/Hosted/sometime-IPOffice, wait, what? another damn system? kill me now.