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chrony

System clock synchronization service that speaks NTP

Chrony keeps your system time accurate. It synchronises your computer's clock with NTP servers, reference clocks such as GPS receivers, or even manual input of the correct time from a wristwatch.

Chrony will determine the rate at which the computer gains or loses time, and compensate for it. It can also operate as an NTPv4 (RFC 5905) server and peer to tell time to other computers on the network.

It's designed to perform well even under adverse conditions: congested networks, unreliable clocks drifting with changes in temperature, and devices or virtual machines that are frequently turned off and connect to the Internet for only a few minutes at a time.

Typical accuracy when synchronised over the Internet is several milliseconds. On a local network this can reach tens of microseconds. With hardware time-stamping or reference clock, sub-microsecond accuracy is possible.

Installation

Install the latest version of chrony as follows:

guix install chrony

Or install a particular version:

guix install chrony@4.6.1

You can also install packages in augmented, pure or containerized environments for development or simply to try them out without polluting your user profile. See the guix shell documentation for more information.

Badge code

You can use the following badge to inform users of chrony about the latest version available in Guix.

Example HTML:

<a href='https://packages.guix.gnu.org/packages/chrony'><img src='https://packages.guix.gnu.org/packages/chrony/badges/latest-version.svg' alt='Version in GNU Guix'></a>

Example Markdown:

[![Version in GNU Guix](https://packages.guix.gnu.org/packages/chrony/badges/latest-version.svg)](https://packages.guix.gnu.org/packages/chrony)

Example Org:

[[https://packages.guix.gnu.org/packages/chrony][https://packages.guix.gnu.org/packages/chrony/badges/latest-version.svg]]