To install ntp on Ubuntu, Linux or debian based distribitions

# apt-get update
# apt-get install ntp

To install ntp on Fedora, Centos or redhat based distribitions

# yum install ntp
After you set your timezone correcly, you should be able to synce your date and time with ntp command

# ntpdate pool.ntp.org

# ntpdate 0.ubuntu.pool.ntp.org
19 Feb 18:42:09 

You can edit the file /etc/ntp.conf to control certain variables with the NTP service, and can start and stop the file using “/etc/init.d/ntp [status|start|stop]”.