1. It sets your computer's clock from time servers on the Net. It consists of a pair of programs : `chronyd'. This is a daemon which runs in background on the system. It obtains measurements (e.g. via the network) of the system's offset relative to other systems, and adjusts the system time accordingly. For isolated systems, the user can periodically enter the correct time by hand (using `chronyc'). In either case, `chronyd' determines the rate at which the computer gains or loses time, and compensates for this. `chronyc'. This is a command-line driven control and monitoring program. An administrator can use this to fine-tune various parameters within the daemon, add or delete servers etc whilst the daemon is running. From Debian 3.0r0 APT