Track time from plugin event

Hi: I am using the plugin event "onTrackAfterSave" to get info from my database (wind speed etc) once the track is saved. Everything is working fine, but I need to get the track start date/time. Is there anything in the $track variable with this info, or is there any way to get the start date and time?

public function onTrackAfterSave($context, $track, $isNew)
{
  // do your stuff
}

Thanks,

Dave