'On that Day' in the Bible

On that day the Lord made a covenant with Abram, saying,“To your descendants I have given this land,From the river of Egypt as far as the great river, the river Euphrates:

So he removed on that day the striped and spotted male goats and all the speckled and spotted female goats, every one with white in it, and all the black ones among the sheep, and gave them into the care of his sons.