Which sounds like the opposite of what Danny Dulai posted in a much, much older thread:
Anyway, I would totally expect the BIOS date/time being displayed in UTC. AFAIK are OSs from Microsoft the only ones (from the list of supported OSs for Roon Server) who set the RTC (BIOS date/time) to local time. If all works as expected, the RTC will even reset to UTC if a user changes it to something else.
The only idea I can think of, where a user might be able to introduce date/time issues possibly, is if he uses a VPN for all the internet traffic of its network that relocates it to a different location in a different timzone than it actually is in. Possibly, I’m not sure about that and can’t remember of any case so far in this forum where this was reported.