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Our home PCs, as by most manufacturers, keeps power to a clock with a battery. The system BIOS reads the clock and Windows/Mac/Linux/I Don't Know syncs the info from the BIOS at startup.
The clock keeps track of time due to a self-updating timestamp or a analogue mechanism (like a watch). In the old PCs the timekeeping circuitry and battery are encapsulated in one package that is often soldered onto the motherboard. It was a bad idea and I don't know if they still use them or not, but I'm guessing no. A DALLAS chip, as they were named, would fail after a number of years (explaining unused-for-5-years XP computers not keeping time or date) but is still used in big computers and mainframes (e.g. Google's self-managing data servers).
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