Chrony
chrony is an implementation of the Network Time Protocol (NTP). It's a replacement for the , which is a reference implementation of the NTP. It runs on Unix-like operating systems (including Linux and macOS) and is released under the GNU GPL v2. It's the default NTP client and server in Red Hat Enterprise Linux 8 and SUSE Linux Enterprise Server 15, and available in many Linux distributions. Support for Network Time Security (NTS) was added on version 4.0. Comparison with the reference implementation. In contrast to NTPsec, which is a fork of ntpd, chrony was implemented from  scratch. It was designed to synchronize time even in difficult conditions such as intermittent network connections (such as laptops) and congested networks. Unlike , it supports synchronizing the system clock via hardware timestamping, improving accuracy of time synchronization between machines on a LAN. It also supports synchronization by manual input, and can perform time correction within an isolated network.