System time

• https://documentation.ubuntu.com/server/how-to/networking/chrony-client/
• https://documentation.ubuntu.com/server/how-to/networking/serve-ntp-with-chrony/
• https://documentation.ubuntu.com/server/how-to/networking/timedatectl-and-timesyncd/
• https://wiki.archlinux.org/title/Chrony
• https://wiki.archlinux.org/title/Systemd-timesyncd
• https://wiki.archlinux.org/title/System_time
• https://wiki.archlinux.org/title/System_time#Time_synchronization
• https://wiki.gentoo.org/wiki/System_time