SYSTEMD-TIMEDATED.SERVICE(8systemd-timedated.serviSYSTEMD-TIMEDATED.SERVICE(8)
NAME
systemd-timedated.service, systemd-timedated - Time and date bus
mechanism
SYNOPSIS
systemd-timedated.service
/lib/systemd/systemd-timedated
DESCRIPTION
systemd-timedated is a system service that may be used as a mechanism
to change the system clock and timezone, as well as to enable/disable
network time synchronization. systemd-timedated is automatically
activated on request and terminates itself when it is unused.
The tool timedatectl(1) is a command line client to this service.
See the developer documentation[1] for information about the APIs
systemd-timedated provides.
LIST OF NETWORK TIME SYNCHRONIZATION SERVICES
systemd-timesyncd will look for files with a ".list" extension in
ntp-units.d/ directories. Each file is parsed as a list of unit names,
one per line. Empty lines and lines with comments ("#") are ignored.
Files are read from /usr/lib/systemd/ntp-units.d/ and the corresponding
directories under /etc/, /run/, /usr/local/lib/. Files in /etc/
override files with the same name in /run/, /usr/local/lib/, and /lib/.
Files in /run/ override files with the same name under /usr/. Packages
should install their configuration files in /usr/lib/ (distribution
packages) or /usr/local/lib/ (local installs).
Example 1. ntp-units.d/ entry for systemd-timesyncd
# /usr/lib/systemd/ntp-units.d/80-systemd-timesync.list
systemd-timesyncd.service
If the environment variable $SYSTEMD_TIMEDATED_NTP_SERVICES is set,
systemd-timesyncd will parse the contents of that variable as a
colon-separated list of unit names. When set, this variable overrides
the file-based list described above.
Example 2. An override that specifies that chronyd should be used if
available
SYSTEMD_TIMEDATED_NTP_SERVICES=chronyd.service:systemd-timesyncd.service
SEE ALSO
systemd(1), timedatectl(1), localtime(5), hwclock(8), systemd-
timesyncd(8)
NOTES
1. developer documentation
https://www.freedesktop.org/wiki/Software/systemd/timedated
systemd 245 SYSTEMD-TIMEDATED.SERVICE(8)