While the exact point in time where the clock passes between AM and PM is 12:00 NOON, the subsequent minute between 12:00:00 NOON and 12:01:00 PM is definitely PM. For example 12:00:30 PM is AFTER the meridian. If you are not showing seconds, it is perfect valid to express the point in time 30 seconds after noon as 12:00 PM and calling it 12:00 AM wouln't be correct. The same goes for the other 59 seconds in that minute.
To sum up, noon itself is neither AM or PM; it is just "M." The rest of the minute between noon and 12:01 PM is 12:00 PM.
To sum up, noon itself is neither AM or PM; it is just "M." The rest of the minute between noon and 12:01 PM is 12:00 PM.

I'm sorry! I didn't mean it like that!
I just meant that it seems natural to assume, what with military time and such, but it is a case of standard usage becoming accepted though the technical meaning is different. *Meekly submits for appropriate punishments*
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