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Some system clocks do not run all that accurately. Some hints on
dealing with clock problems can be found in the Clock mini HOWTO at
https://www.tldp.org/HOWTO/Clock.html, but the
hwclock and adjtimex manual pages tend to be
an easier read!
Be warned though, the Debian suggestion is not to fiddle with
hwclock. It is highly recommended that you install the
ntp-simple
package (to run a daemon that checks regularly
to keep your clock in sync) and/or ntpdate
(to update your
clock at each boot or to manually run a command to update your clock)
to keep your clock accurate. These are discussed in more detail below.
If you install both ntp-simple
and ntpdate
and
you manually set up cron to run ntpdate
every
hour then you will probably receive email every hour to tell you that
ntpdate can't get the ntp socket (because the
ntpd daemon from ntp-simple
is probably using
it!):
6 Oct 09:08:02 ntpdate[23856]: the NTP socket is in use, exiting
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Just install one of them!
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