HWCLOCK - Online Linux Manual PageSection : 5
Updated : Dec 2020
Source :
Note : Debian Administrator's Manual

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NAMEhwclock − settings that affect the behaviour of the hwclock init script

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DESCRIPTIONThe /etc/default/hwclock file contains settings in POSIX format:  VAR=VAL Only one assignment is allowed per line. Comments (starting with '#') are also allowed.

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SETTINGSThe 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.

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

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SEE ALSOhwclock(8), systemd-timesyncd.service(8) 0

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