Wiktionary
birthtime
n. (context astrology English) The exact time when someone was born; the time of birth
Usage examples of "birthtime".
Since first Boniface Reynaud came here from his birthtime nine hundred years futureward, he had spent two decades creating the career of Reinault Bodel, who worked his way from youthful obscurity to the status of a respectable dealer in wool.
And he spoke the same words that had been said to him so very long ago, so very far away, at the birthtime of his soul.