[arch-general] Systemd and time synchronisation problems

Jan Steffens jan.steffens at gmail.com
Tue Sep 11 14:51:23 EDT 2012

On Tue, Sep 11, 2012 at 8:27 PM, Thomas Bächler <thomas at archlinux.org> wrote:
> 2) When chrony is not running, systemd-timedated runs periodically to
> adjust the hardware clock for drift (AFAIK, not sure that is the job
> that timedated does).

No. When chrony isn't running, the hwclock isn't getting adjusted at
all. The only thing systemd does on startup is warp the system clock
if and only if the RTC is running in localtime.

systemd-timedated's job is to provide a DBus interface to change
system time and date settings:
  SetTime, SetTimezone, SetLocalRTC (whether RTC is in localtime),
SetNTP (whether NTP is enabled)
It's used by gnome-control-center, at least. The SetNTP call uses the
ntp-units.d directory to select an implementation.

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