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For these operating systems, it is recommended to use localtime.If you are using newer versions of Windows, you may safely disregard this warning.If this does occur, at this point in the boot sequence, the hardware clock time is assumed to be UTC and the value of .Hence, having the hardware clock using localtime may cause some unexpected behavior during the boot sequence; e.g system time going backwards, which is always a bad idea (there is a lot more to it).One reason users often set the RTC in localtime is to dual boot with Windows (which uses localtime).However, Windows is able to deal with the RTC being in UTC with a simple registry fix.the Real Time Clock (RTC) or CMOS clock) stores the values of: Year, Month, Day, Hour, Minute, and Seconds.It does not have the ability to store the time standard (localtime or UTC), nor whether DST is used. the software clock) keeps track of: time, time zone, and DST if applicable.
You can check what you have set your Arch Linux install to use by: automatically and update the RTC accordingly; no further configuration is required.If you are having issues with the offset of the time, try reinstalling Ubuntu and its derivatives have the hardware clock set to be interpreted as in "localtime" if Windows was detected on any disk during Ubuntu installation.This is apparently done deliberately to allow new Linux users to try out Ubuntu on their Windows computers without editing the registry. To check the current zone defined for the system: for details.After boot-up has completed, the system clock runs independently of the hardware clock.
The Linux kernel keeps track of the system clock by counting timer interrupts.It is calculated by the Linux kernel as the number of seconds since midnight January 1st 1970, UTC.