The NTP protocol allows you to synchronise the clock of your computer with that of dedicated time servers on the Internet.
Get the necessary packages with the following command:
user@ubuntu:~$ sudo apt-get install ntp-simple ntpdate
Stop the ntpd daemon and manually synchronise your computer’s clock with the following two commands:
user@ubuntu:~$ sudo /etc/init.d/ntp-server stop
user@ubuntu:~$ sudo ntpdate pool.ntp.org
Modify the file /etc/ntp.conf to read:
# You do need to talk to an NTP server or two (or three).
#server ntp.your-provider.example
#server ntp.ubuntu.com
server 0.pool.ntp.org
server 1.pool.ntp.org
server 2.pool.ntp.org
Start the ntpd daemon with the following command:
user@ubuntu:~$ sudo /etc/init.d/ntp-server start
After about one minute, query the status of the ntpq daemon with the following command:
user@ubuntu:~$ sudo ntpq -p
You can further increase the accuracy of time synchronisation by using the time servers in your continental or country zone.