Chrony is a pair of programs for maintaining the accuracy of computer clocks. The reference time can be derived from either Network Time Protocol (NTP) servers (preferred), or wristwatch-and-keyboard (via chronyc). The main source of information about the Network Time Protocol is http://www.eecis.udel.edu/~ntp. It is designed so that it can work on computers which only have intermittent access to reference sources, for example computers which use a dial-up account to access the Internet. Of course, it will work on computers with permanent connections too. Chronyd can also operate as an RFC1305-compatible NTP server and peer.