www.naumann.cc

This how to is based on the ubuntu documentation. First we have to add the basic packages:

sudo apt-get install ntp ntpdate

Than we have to do some basic configuration:

echo "ntpdate ntp.ubuntu.com pool.ntp.org " >> /etc/cron.daily/ntpdate
sudo chmod 755 /etc/cron.daily/ntpdate
echo "server ntp.ubuntu.com" >> /etc/ntp.conf
echo "server pool.ntp.org" >> /etc/ntp.conf

Have a look at this page for more ntp Servers.

I had to change my timezone as well, this can be done by changing a symbolic link:

ln -sf /usr/share/zoneinfo/Europe/Berlin /etc/localtime

Just replace Europe/Berlin by your timezone. You can find more information about changing timezones here.