@weekend_editor @pmidden I can't comment on Symbolics stuff, it used a internal clock chip or something to get the time instead of (by default) asking the network.
The CADR had no real RTC ... it would ask the network for the time (32-bit) and then be happy, using a 60Hz tick from the electrical network to keep track (I think).
I had to fix a bunch of places in the System code to manage 2000 ...