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Exactly the same question as this one, but for Fedora 26 in 2017: https://askubuntu.com/questions/217463/what-is-the-package-and-background-process-for-network-time#232486

In Fedora 26 Workstation (Gnome), if you open 'All Settings' and then choose 'Date & Time' from the 'System' menu, there is an option for 'Automatic Date & Time' which requires Internet access.

What background process controls this? It doesn't seem to be ntpd. Is there a particular package associated with this feature?

(By the way, if there is a method to figure out the answer to a question like this, that would be nice to know).

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chrony is the default NTP client, offering better time synchronization on systems not always connected to the internet or on systems with unstable clocks. It should be installed by default, and is found in the chrony package. You can still use the ntpd daemon from the ntp package if desired. There are a few cases where you might want to do this (see the documentation link below).

The chrony daemon (chronyd) can be controlled at the command-line with chronyc. For example, the available time sources configured can be seen with chronyc sources, much like you would use ntpq -pn with the classic NTP client.

The chrony Red Hat documentation provides a nice overview of chrony for Red Hat, CentOS and Fedora (of course). A successive chapter in the same document describes the classic ntp setup. To use ntp you must disable chrony.

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