What is the real-time clock (RTC)?
This is the clock which keeps the time even when your computer is turned off. It works with 1 second resolution. chronyd can monitor the rate at which the real-time clock gains or loses time, and compensate for it when you set the system time from it at the next reboot. See the documentation for details. 9.2. I want to use chronyd’s real-time clock support. Must I disable hwclock? The hwclock program is often set-up by default in the boot and shutdown scripts with many Linux installations. If you want to use chronyd’s real-time clock support, the important thing is to disable hwclock in the shutdown procedure. If you don’t, it will over-write the RTC with a new value, unknown to chronyd. At the next reboot, chronyd will compensate this (wrong) time with its estimate of how far the RTC has drifted whilst the power was off, giving a meaningless initial system time. There is no need to remove hwclock from the boot process, as long as chronyd is started after it has run. 9.3. I just keep g
