tldr/pages/linux/hwclock.md

hwclock

Used for reading or changing 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