adjtimex - 1.29-11.1 main

This package provides a utility to manipulate the kernel time
variables. For a machine connected to the Internet, or equipped with
a precision oscillator or radio clock, the best way to keep the
system clock accurate is using NTP (Network Time Protocol). However,
for a standalone or intermittently connected machine, you may use
adjtimex instead to at least correct for systematic drift. It can
optionally adjust the system clock using the CMOS clock as a
reference, and can log times for long-term estimation of drift rates.