'Third Day' in the Bible

Then said Jonathan unto David - Witness be Yahweh God of Israel, that I will sound my father about this time to-morrow or the third day, and lo! if there he good towards David, will I not, then, send unto thee, and unveil thine ear?

And it came to pass, when David and his men came to Ziklag on the third day, that, the Amalekites, had made a raid into the South, and into Ziklag, and had smitten Ziklag, and burned it with fire;