The Scenario
The system is not configured to use the ntpd service to synchronize time and date.
CentOS/RHEL 7 uses systemd to manage services. The timedatectl utility is distributed as part of the systemd, and allows you to review and change the configuration of the system clock: change the current date and time, set the time zone, or enable automatic synchronization of the system clock with a remote server.
The NTP service is enabled, but as this system is running CentOS/RHEL 7, timedatectl also needs to be configured to enable NTP, as it is used to manage the date and time on the system.
# timedatectl ... NTP enabled: no ...
This shows system is not using NTP.
The Solution
Force NTP usage for time synchronisation:
# timedatectl set-ntp 1
Then do the following:
1. Restart systemd time date control.
# systemctl restart systemd-timedated.service
2. Start the ntp service
# systemctl start ntpd
3. Sync the time with the remote server
# ntpq -p