Use an unprivileged port in case a firewall is blocking privileged ports

Synchronize and set the date and time via NTP.
More information: <http://support.ntp.org/documentation>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

sudo ntpdate -u {{host}}

click the source code to copy install ntpdate on any operating system with command-not-found.com