For what it's worth, this from Wikipedia: The American Heritage Dictionary of the English Language has a usage note on this topic: "By convention, 12 AM denotes midnight and 12 PM denotes noon....
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For what it's worth, this from Wikipedia: The American Heritage Dictionary of the English Language has a usage note on this topic: "By convention, 12 AM denotes midnight and 12 PM denotes noon....
I assume this is because of people using either am and pm when referring to the hour 12 noon. As am means "before noon" and pm means "after noon", the hour 12 cannot be either am or pm and is just 12...