My original searches were finding the NTP Prime Epoch results - it was only later searching that had me realize that UBB was using the Unix Prime Epoch
.
https://www.eecis.udel.edu/~mills/y2k.html
So it's not that Google was wholly wrong in my initial searches. It just gave me the NTP as the default results for my search and I didn't realize until researching that the values didn't match what I was seeing in our system.
I suppose what would help is a database table map that explained how each field is used in UBB - do we have one? I'd find that to be really useful!