Search notes:
/etc/adjtime
The configuration and state file for
hwclock (aka
adjtime file). It keeps track of the
systematic drift of the
hardware clock.
I had to create this file by executing
sudo hwclock --systohc
The /etc/adjtime file might look as follows:
0.000000 1492635067 0.000000
1492635067
UTC
FHS
Apparently, the FHS recommends to store the adjtimefile in
/var/lib/hwclock instead of the usual
/etc/adjtime.