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Typically, BIOS should use UTC clock, and system clock should be working depend on ../Timezone setting.
However, there is a difference when we have one of Microsoft's operating system on our machine. They set local time also in BIOS.
To avoid differences between Windows and PLD edit /etc/sysconfig/clock and set:
UTC="false"
If you have only PLD (or PLD and other *nix) set:
UTC="true"