'Midnight' in the Bible

And Moses saith, 'Thus said Jehovah, About midnight I am going out into the midst of Egypt,

And it cometh to pass, at midnight, that Jehovah hath smitten every first-born in the land of Egypt, from the first-born of Pharaoh who is sitting on his throne, unto the first-born of the captive who is in the prison-house, and every first-born of beasts.