Hardware clock
Set the BIOS / EUFI time to UTC time.
Use command hwclock (see man page) to adjust the hardware (bios/eufi) clock from a running linux installation.
On Gentoo:
/etc/init.d/hwclock
/etc/conf.d/hwclock
On Ubuntu and derivatives:
/etc/default/rcS
UTC=yes
// Show hardware time:
# hwclock
2018-03-01 02:09:17.796233+0000
// Show system time:
# date
Thu Mar 1 02:09:37 -00 2018
// Set hardware clock to proper UTC time:
# hwclock --set --date "03/01/2018 02:03:00"
