As best I can determine, *sort has no support for a Julian, Lilian, or any similar day number. You may have to write a programette; to the left, I doubt that that's more than a couple hours' worth of effort.
 A real Julian day number, not an ordinal date.
"You have sat too long for any good you have been doing lately ... Depart, I say; and let us have done with you. In the name of God, go!" -- what I say to a junior programmer at least once a day