Does adding NTP-servers do any difference:
LibreELEC Settings - LibreELECIt should do the trick...
Thanks Jocke.Sve,
I actually thought of that and added NTP-servers thinking that one of them should give the system the correct time. I rebooted twice after, thinking it may have to reboot to fetch the time, but to no avail.
I shut down the RPi last night and will look at it when I get back home tonight.