NTP Server: 

sudo apt-get install ntp
sudo ntpq -p
timedatectl
sudo timedatectl set-ntp on
sudo ntpdate -s time.nist.govsntp --version

sudo service ntp status

sudo vim /etc/ntp.conf


#server 0.ubuntu.pool.ntp.org
#server 1.ubuntu.pool.ntp.org
#server 2.ubuntu.pool.ntp.org
#server 3.ubuntu.pool.ntp.org
server 0.in.pool.ntp.org
server 1.in.pool.ntp.org
server 2.in.pool.ntp.org
server 3.in.pool.ntp.org


sudo service ntp restart


On Client pc:

sudo vim /etc/hosts


192.168.2.30 gcubeftp.gc-solutions.net

sudo ntpdate gcubeftp.gc-solutions.net