Theory of why Jay said it was at Midnight

I believe this was totally intentional on his part, because he knows this is impossible. I think he wanted to tip people off that it really wasn't Adnan, without having to say it.

Either he was afraid of the other person who really did it, but he is less afraid now, or else his conscience is just starting to get to him.

I think this is also why he said the weird line, if not Adnan, then who.

I think he knows that if they look deeply enough into the story, if its at midnight, it couldn't have been Adnan.

Its the only explanation that makes sense, all these years later, why he would say this.