'On that Day' in the Bible

And on that day Pharaoh commanded the slave drivers over the people and his foremen, saying,

But on that day I will distinguish the land of Goshen, where my people are staying, by there not being flies there, so that you will know that I [am] Yahweh in the midst of the land.

And you shall tell your son on that day, saying, 'This [is] because of what Yahweh did for me when I came out from Egypt.'

And Yahweh saved Israel on that day from the hand of Egypt, and Israel saw the Egyptians dead on the shore of the sea.

And the sons of Levi did according to the word of Moses, and from the people on that day about three thousand persons fell.