One of mine is the same. I just set the time right and left the date.
Want to try a firmware flash, next time you're passing, see if it resolves it?
Give me plenty of notice, as chrisgixer has my Tech2 I think. Either that, or I've put it somewhere safe, lol.
I am a fair bit closer to OOF HQ having moved last year, but.... MOT runs out on the black Omega end of this month and unless someone wants it (and wants to plate and weld up an inner wing and a few other jobs) it'll be cubed most likely

Mind you, I still have the ornament one as well - but that'd involve fitting a battery and seeing what the NCDC does in that!