'On that Day' in the Bible

So then Pharaoh gave command on that day, unto the taskmasters over the people and unto their overseers - saying:

then will I make to differ on that day, the land of Goshen wherein my people do dwell, so that there shall not be there a gad-fly! in order that thou mayest know, that I, Yahweh, am in the midst of the land;

And thou shalt toll thy son, on that day, saying, - This is because, of that which Yahweh did for me, when he brought me forth out of Egypt.

Thus did Yahweh, on that day, save Israel, out of the hand of the Egyptians, - and Israel saw the Egyptians, dead on the shore of the sea.

So the sons of Levi did, according to the word of Moses, - and there fell from among the people on that day, about three thousand men.