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Eventually 12 pm hits

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There's no such thing as 12 PM.

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What do you mean? 12PM is noon.

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How can 12 PM be noon when PM means (roughly) after noon? 12 hours after noon = noon?

Check out:

http://wwp.greenwichmeantime.com/info/noon.htm

which is only the first of many sites a google search spits out that will tell you the same thing.