Time was I was unknown; but I am now known to be the son of the late and the brother

Time was I was unknown; but I am now known to be the son of the late and the brother of the present time, and the grandson of the former time, and the grandson of the latter time. I am the heir of the time that has been, and the father of the time that must be. I am the present time, and from being past and to come, am, in the midst of the past and the future, the present time. I am the father of the hours, and the son of the hours. I am the mark that must be from the first to the last, and from the last to the first, from the beginning to the end, and from the end to the beginning, and from being the beginning and the end, am the time that must be