tldr/pages/linux/hwclock.md

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hwclock

Read or change the hardware clock. Usually requires root. More information: https://manned.org/hwclock.

  • Display the current time as reported by the hardware clock:

hwclock

  • Write the current software clock time to the hardware clock (sometimes used during system setup):

hwclock --systohc

  • Write the current hardware clock time to the software clock:

hwclock --hctosys