systemd-timedated.service, systemd-timedated — Time and date bus mechanism
systemd-timedated.service
/usr/lib/systemd/systemd-timedated
systemd-timedated is a
                system service that may be used as mechanism to change
                the system clock and timezone, as well as to
                enable/disable NTP 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 for information about
                the APIs systemd-timedated
                provides.