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In particular, it is recommended to set the hardware clock to UTC, in order to avoid conflicts between the installed operating systems.

For example, if the hardware clock was set to localtime, more than one operating system may adjust it after a DST change, thus resulting in an overcorrection; more problems may arise when travelling between different time zones and using one of the operating systems to reset the system/hardware clock.

An OS that uses the UTC standard, generally, will consider CMOS (hardware clock) time a UTC time (GMT, Greenwich time) and make an adjustment to it while setting the System time on boot according to your time zone.

If you have multiple operating systems installed in the same machine, they will all derive the current time from the same hardware clock: for this reason you must make sure that all of them see the hardware clock as providing time in the same chosen standard, or some of them will perform the time zone adjustement for the system clock, while others will not.

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).

The #Hardware clock and #System clock time may need to be updated after setting this value.

The standard used by hardware clock (CMOS clock, the time that appears in BIOS) is defined by the operating system.

By default, Windows uses localtime, mac OS uses UTC, and UNIX-like operating systems vary.

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.

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