Linux time synchronization
From thelinuxwiki
The your hardware clock is set to UTC (or GMT, Greenwich Mean Time) and then your timezone is taken into account to determine the actual, local time
configure timezone
on gentoo:
/etc/timezone
update time with ntp-client
then
Setting the hardware clock during shutdown
Hardware clocks are not very accurate. (See the NTP.org article on clock quality.)
To avoid this, you can set your hardware clock during shutdown.
For baselayout >= 2.0.0:
File: /etc/conf.d/hwclock
clock_systohc="YES"
manual synchronization
to synchronize your hardware time with your system time
hwclock --systohc
Again, to check your work, run:
hwclock --show
If the following error is received:
hwclock: Cannot access the Hardware Clock via any known method.
Then the real time clock is most likely not enabled in the kernel. Set in kernel config:
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