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NIST use NTP as anyone else
Network Time Protocol (NTP)
NIST Internet Time Service (ITS)
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Set your computer clock via the Internet using tools built into the operating system
NIST has established a mailing list (Google Group) to inform users of status changes of the Internet Time Service.
If you wish to subscribe to this list, please send your name and email address to: internet-time-service@nist.gov
We are phasing out the ftp access to the time servers.
All of the public files on the time servers, including example source code for programmers who want to write their own applications, have been moved to this public ftp site:
ftp.boulder.nist.gov/pub/time.
Most operating systems (i.e. Windows, Mac, Linux) have an option to automatically synchronize the system clock periodically using an NTP (network time protocol) server:
Windows: Double-click the system clock and then click on the Internet Time tab.
Mac: Applications System Preferences > Date & Time
Linux: System Admin >Time and Date
https://www.nist.gov/pml/time-and-frequency-division/time-distribution/internet-time-service-its