![]() To check the current system clock time (presented both in local time and UTC) as well as the RTC (hardware clock): The Linux kernel keeps track of the system clock by counting timer interrupts. After boot-up has completed, the system clock runs independently of the hardware clock. The initial value of the system clock is calculated from the hardware clock, dependent on the contents of /etc/adjtime. It is calculated by the Linux kernel as the number of seconds since midnight January 1st 1970, UTC. the software clock) keeps track of: time, time zone, and DST if applicable. See hwclock(8) § The Adjtime File for more information on this file as well as the #Time skew section. Additionally it updates /etc/adjtime or creates it if not present. The following sets the hardware clock from the system clock. Only 2016, or later, UEFI firmware has the ability to store the timezone, and whether DST is used. the Real Time Clock (RTC) or CMOS clock) stores the values of: Year, Month, Day, Hour, Minute, and Seconds. Set the hardware clock from the system clock on shutdown. ![]() Keep accurate time of the system clock, see #Time synchronization.Set the system clock from the hardware clock on boot.Standard behavior of most operating systems is: ![]() Two clocks are present on systems: a hardware clock and a system clock which are also detailed in this article. This article explains what they are and how to read/set them. In an operating system, the time (clock) is determined by three parts: time value, whether it is local time or UTC or something else, time zone, and Daylight Saving Time (DST) if applicable. Reason: This article mostly documents systemd timedatectl explain basic commands like date and hwclock first (Discuss in Talk:System time)
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