'Midnight' in the Bible

And Moses said, Thus saith Jehovah, About midnight will I go out into the midst of Egypt:

And it came to pass at midnight, that Jehovah smote all the first-born in the land of Egypt, from the first-born of Pharaoh that sat on his throne unto the first-born of the captive that was in the dungeon; and all the first-born of cattle.