Install the time chrony

 https://shazi.info/chrony-%E7%B3%BB%E7%B5%B1%E6%A0%A1%E6%99%82%E5%B7%A5%E5%85%B7%EF%BC%8C%E6%8A%8A%E9%81%8E%E6%99%82%E7%9A%84-ntpdate-%E4%B8%9F%E6%8E%89%E5%90%A7/

 yum install chrony -y

 service chronyd start

chkconfig chronyd on

 vim /etc/chrony.conf

service chronyd restart

https://xyz.cinc.biz/2016/09/centos-7-chrony.html

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system_administrators_guide/ch-configuring_ntp_using_the_chrony_suite#sect-differences_between_ntpd_and_chronyd