systemd-time-wait-sync.service, systemd-time-wait-sync - Wait until kernel time is synchronized

       systemd-time-wait-sync is a system service that delays the start of units that are ordered after
       time-sync.target (see systemd.special(7) for details) until the system time has been synchronized with an
       accurate remote reference time source by systemd-timesyncd.service.

       systemd-timesyncd.service notifies systemd-time-wait-sync about successful synchronization.
       systemd-time-wait-sync also tries to detect when the kernel marks the system clock as synchronized, but
       this detection is not reliable and is intended only as a fallback for compatibility with alternative NTP
       services that can be used to synchronize time (e.g., ntpd, chronyd).

/run/systemd/timesync/synchronized
           The presence of this file indicates to this service that the system clock has been synchronized.

           Added in version 239.

       systemd-time-wait-sync.service, systemd-time-wait-sync - Wait until kernel time is synchronized

systemd(1), systemd.special(7), systemd-timesyncd.service(8)

systemd 257.7                                                                  SYSTEMD-TIME-WAIT-SYNC.SERVICE(8)

       systemd-time-wait-sync.service

       /usr/lib/systemd/systemd-time-wait-sync