Isso é feito sincronizando com a ferramenta
NAME ntpdate - set the date and time via NTP ntpdate sets the local date and time by polling the Network Time Proto‐ col (NTP) server(s) given as the server arguments to determine the cor‐ rect time. It must be run as root on the local host (unless the option -q is used). A number of samples are obtained from each of the servers specified and a subset of the NTP clock filter and selection algorithms are applied to select the best of these. Note that the accuracy and reliability of ntpdate depends on the number of servers, the number of polls each time it is run and the interval between runs. ntpdate can be run manually as necessary to set the host clock, or it can be run from the host startup script to set the clock at boot time. This is useful in some cases to set the clock initially before starting the NTP daemon ntpd. It is also possible to run ntpdate from a cron script. However, it is important to note that ntpdate with contrived cron scripts is no substitute for the NTP daemon, which uses sophisti‐ cated algorithms to maximize accuracy and reliability while minimizing resource use. Finally, since ntpdate does not discipline the host clock frequency as does ntpd, the accuracy using ntpdate is limited.
Você pode fazer isso com
sudo ntpdate TIME-SERVER
As listas TIME-SERVER podem ser encontradas aqui