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"Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use." -

ntp daemon in systemd

Systemd has its own time and date tools that replace classic linux tools like ntpd. See systemd-timesyncd and timedatectl. systemd-timesyncd refuses to start if the ntp package is installed.

See Also

  • time - Notes on time technologies
  • ptp - Precision Time Protocol