Time and date bus mechanism
systemd-timedated.service
/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 \m[blue]developer documentation\m[]\s-2\u[1]\d\s+2 for information about the APIs systemd-timedated provides.
developer documentation
http://www.freedesktop.org/wiki/Software/systemd/timedated