https://forum.proxmox.com/threads/setting-time-options.28099/

System time is generally viewed as UTC Time - which I can understand for standardization.
Will have to 'adjust' my expectations.

Question: have you tried setting up the DHCP server as the time master, and having the Centos system sync time to the DHCP server (with said DHCP server syncing to NIST or whatever time source you prefer) instead of the NTP Pool? That way theoretically DHCP server and Centos should be at the same time. Just a thought.