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The hwclock command provides the interface to the hardware clock. If you are wanting to ensure the correct time then with a default Debian set up it is recommended that you use ntp instead if you can. When you reboot the system will save the current correct time to the hardware clock.
Anyhow, the --adjust option of the hwclock command
checks information stored in the configuration file
/etc/adjtime and makes an actual correction to the time stored
in the hardware clock to account for the drift that it (the
hwclock utility) has been monitoring. (Each time you set the
hardware clock with the hwclock command the current time is
compared to the previous time it was corrected to determine the amount
of drift.) Thus, when setting the system clock from the hardware clock
it is advisable to do the following:
# hwclock --adjust # hwclock --hctosys
When updating the hardware clock from an accurate system clock do:
# hwclock --systohc
