hwclock
Used for reading or changing the hardware clock. Usually requires root. More information: https://manned.org/hwclock.
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Display the current time as reported by the hardware clock:
hwclock
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Write the current software clock time to the hardware clock (sometimes used during system setup):
hwclock --systohc
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Write the current hardware clock time to the software clock:
hwclock --hctosys
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