I'm running these:
~$ sudo date --set="2021-06-09 16:33:50.0"
Wed Jun 9 16:33:50 UTC 2021
~$ sudo hwclock --systohc
once the system is rebooted it loses the info and its 4 hours off.
This is an offline system and there is no ntp or chrony solution that will work.
sudo journalctl -b 0
. Readman timedatectl
.