HWCLOCK(5)                 (Dec 2020)                  HWCLOCK(5)

     NAME
          hwclock - settings that affect the behaviour of the hwclock
          init script

     DESCRIPTION
          The /etc/default/hwclock file contains settings in POSIX
          format:

               VAR=VAL

          Only one assignment is allowed per line.  Comments (starting
          with '#') are also allowed.

     SETTINGS
          The following settings can be set.

          HCTOSYS_DEVICE
               The hardware clock device you want to use.  Defaults to
               rtc0.  It should probably match the
               CONFIG_RTC_HCTOSYS_DEVICE kernel config option.

               If you change this, you also need to install a custom
               udev rule, mirroring /usr/lib/udev/rules.d/85-
               hwclock.rules. Otherwise, the hardware clock device
               will be ignored during boot.

               On almost all systems, this should not be changed.

     NOTES
          On systems using systemd as init, the hwclock init script is
          ignored.

     SEE ALSO
          hwclock(8), systemd-timesyncd.service(8)

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