Installation

 
sudo apt-get update && sudo apt-get upgrade  
sudo apt-get install ntp
sudo systemctl stop systemd-timesyncd
sudo systemctl disable systemd-timesyncd
sudo systemctl stop ntp
sudo systemctl start ntp
sudo nano /etc/ntp.conf
Add the following:

                    server 0.ie.pool.ntp.org
                    server 1.ie.pool.ntp.org
                    server 2.ie.pool.ntp.org
                    server 3.ie.pool.ntp.org
                    
sudo systemctl restart ntp

 

To check if time is synchronizing properly.

ntpq -pn

 

Documentation

 
https://www.pool.ntp.org/zone/ie  
http://raspberrypi.tomasgreno.cz/e