By default, the ntp service is not installed with CentOS 6.
First, install ntp from yum:
yum install ntp
Then, force a time sync by running the following command:
ntpdate 0.us.pool.ntp.org
Next, make sure the service is turned on at next boot:
chkconfig ntpd on
Finally, start the ntdp service:
service ntpd start
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