sntpd
An SNTP server. tldr-pages
On macOS
macOS
An SNTP server. Note: It should not be invoked manually.
Start the daemon
sntpdIdentifyOverwrite existing state with the local clock (stratum 1), for running a master/primary server, without synchronizing with another (higher stratum) server
sntpd -LIdentifyUse a custom file for the SNTP state
sntpd -z path/to/state.binIdentify