Install NTP and NTP Date
If you haven't already got NTP and NTP Date installed, you'll need to do that first.
yum install -y ntp ntpdate
Preliminary Sync
We like to use the Canadian NTP servers, as we're based in Canada. If you're in the US, you can use us.pool.ntp.org. If you're anywhere else in the world, you can use the generic pool.ntp.org or check out the list of NTP servers here
ntpdate ca.pool.ntp.org
Configure NTPd to use Local Servers
This step isn't necessary but I always like NTPd to be using relatively local servers.
Open up the ntpd config file and configure it with your local NTP servers.
nano /etc/ntp.conf
server 0.ca.pool.ntp.org iburst server 1.ca.pool.ntp.org iburst server 2.ca.pool.ntp.org iburst server 3.ca.pool.ntp.org iburst
Make sure NTPd Starts on Boot
systemctl enable ntpd.service
Start NTPd
systemctl start ntpd.service