ntp/systemd/ntpdate.service

   1 [Unit]
   2 Description=Set time via NTP
   3 After=syslog.target network.target nss-lookup.target
   4 Before=time-sync.target
   5 Wants=time-sync.target
   6
   7 [Service]
   8 Type=oneshot
   9 ExecStart=/usr/lib/ntpdate-wrapper
  10 RemainAfterExit=yes
  11
  12 [Install]
  13 WantedBy=multi-user.target