Extract from systemd.special
Services responsible for synchronizing the system clock from a remote source (such as NTP client implementations) should pull in this target and order themselves before it. All services where correct time is essential should be ordered after this unit, but not pull it in. systemd automatically adds dependencies of type After= for this target unit to all SysV init script service units with an LSB header referring to the "$time" facility.
LE currently has Kodi depend on network-online.target, but there can be a variable delay before the clock is sync'd. Implementing time-sync.target and having Kodi depend on it would would avoid problems with e.g. mounting network shares.