'In that Day' in the Bible

And they took it in that day, and struck it with the edge of the sword; and every soul in it he completely destroyed that day, according to all that he had done to Lachish.

And now give me this mountain of which Jehovah spoke on that day. For you heard in that day how the giants were there, and that the cities were great and fortified. If Jehovah will be with me, then I will be able to drive them out, as Jehovah said.