Make sure ntp is installed.

yum install ntp

Edit /etc/ntp.conf/ and add the following lines where needed:

server hickory.byu.edu 
server dickory​​.byu.edu
server dock.byu.edu​​

• These are the BYU time servers.

Execute the following:

/sbin/chkconfig –level 2345 ntpd on

• Now ntp will always run on a reboot.

Next do to make sure both are using the BYU servers.

service ntpd status