At work today I had a receptionist advise me on the phone that my contact would be back tomorrow at noon-thirty. I knew exactly what she meant (half past noon) and liked the term immediately (it has a certain ring to it), although I'm not sure I've ever heard it used before. It's much less lugubrious than saying "twelve-thirty am" or "twelve-thirty pm". And I can't imagine ever using "midnight-thirty", just doesn't make it to my mind. Has anyone ever heard or used noon-thirty before? Or is this an emerging usage?