It's neither, 12 noon and 12 midnight are just that although there are a lot of illiterates in positions where they should know better!)
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Midnight... 12:00 Am Noon... 12:00 Pm
No, noon is not the same as afternoon. Noon is specifically 12:00 midday - and less precisely, the general time period from about 11:00 am to 1:00 pm. Afternoon has no specific time associated with it, but is the period from 12:00 midday to the equally imprecise 'evening' - but which is generally considered to begin around 5:00 or 6:00 pm.
930
AM stands for Ante Meridiem, PM stands for Post Meridiem. Basically translated into English, Before Noon, and After Noon, respectively. Thus the change from 11:59 AM to 12:00 PM.
Noon is PM, midnight is AM.