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+chrony is a versatile implementation of the Network Time Protocol (NTP). It can
+synchronise the system clock with NTP servers, reference clocks (e.g. GPS
+receiver), and manual input using wristwatch and keyboard. It can also operate
+as an NTPv4 (RFC 5905) server and peer to provide a time service to other
+computers in the network.
+
+It is designed to perform well in a wide range of conditions, including
+intermittent network connections, heavily congested networks, changing
+temperatures (ordinary computer clocks are sensitive to temperature), and
+systems that do not run continuosly, or run on a virtual machine.
+
+Typical accuracy between two machines synchronised over the Internet is within
+a few milliseconds; on a LAN, accuracy is typically in tens of microseconds.
+With hardware timestamping, or a hardware reference clock, sub-microsecond
+accuracy may be possible.
+
+Two programs are included in chrony, chronyd is a daemon that can be started
+at boot time and chronyc is a command-line interface program which can be used
+to monitor chronyd’s performance and to change various operating parameters
+whilst it is running.