It’s an “undocumented feature”!
The printer software sets the tank’s date to the date and time from the Internet.
It doesn’t verify if “today’s date” is correct by checking if the printer is online and time synced, nor if the date is default epoch, nor if the date is older than the printer’s software release date, nor if the date is older than the printer’s manufacturing date, nor even if the date is older than the tank’s manufacturing date. Neither does it sanity check that the life used on the tank means it is older than the internet itself. I doubt it reads back what it has written to the tank EEPROM to verify it saved correctly. It looks like inexperienced programmers and no quality control.
You can ignore it, but I think you can no longer remote print, because manual intervention is needed?
There are other issues:
You can start on-boarding while the printer is primed.
You can’t manually set the time and date.
You can’t reset, or set a specific time/date on a tank without taking printer out of service so an engineer can log in.
If the ambient is less than 18 deg C it will heat the resin indefinitely without a timeout.
You can prime the printer (for remote printing) when the printer is offline.
Printer says it’s on-line and has an IP address showing when it’s not connected.
You can send a job to the printer by wifi and it starts, but you can’t track it because it’s off line.
The tank filling system doesn’t work - the solenoid/motor driver overheats.
It would be great if there was a permanent forum space, where the known and new issues could be updated by owners and FormLabs could acknowledge and update progress on resolving.