I have two PC, its OS is Windows 8.1 embedded. I don't connect it to internet, set the time zone"(UTC+10:00)Canberra, Melbourne, Sydney", disable daylight time. At 2021-10-4 , I adjusted the time from 10/4/2021 3:23:42 PM to 10/4/2021 4:23:01 PM , but at 2021-10-24, it adjusted the time from 10/24/2021 2:45:32 AM to 10/24/2021 1:45:23 AM itself. I looked up Windows events, it says:
"The system time has changed to 2021-10-24T09:45:22.500000000Z from 2021-10-24T10:45:31.235292400Z.
Change Reason: System time synchronized with the hardware clock."
10/24/2021 5:45:22 PM
Who can tell me why it happened? Is it because the hardware clock using daylight ? but there is no settings in BIOS to do this. Or when I changed the time at 10/4/2021, it didn't synchronize with the hardware clock , it changed back 20 days later?
