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.
Comparison with the reference implementation.
Unlike , 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.