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 a 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.