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I manage several dozen OS X server boxes, and this issue causes my servers to drift out of sync, leading to all sorts of problems. But creating a script that uses the network time server functions of the systemsetup command, combined with crontab, to force resyncing on a regular basis.
Manually specify desired timeserver - Mac OS X Hints Control the Network Time Server settings from the command lineAuthored by: rsnyder on Apr 07, '08 10:25:57AM. From the command line you can use the systemsetup command to interact with the time macOS Server - Apple