systemd systemd-timedated.service 8 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 timedatectl1 is a command line client to this service. See the developer documentation for information about the APIs systemd-timedated provides. $SYSTEMD_TIMEDATED_NTP_SERVICES Colon-separated list of unit names of NTP client services. If not set, then systemd-timesyncd.service8 is used. See the entries of NTP related commands of timedatectl1 for details about this. Example: SYSTEMD_TIMEDATED_NTP_SERVICES=ntpd.service:chronyd.service:systemd-timesyncd.service systemd1, timedatectl1, localtime5, hwclock8, systemd-timesyncd8