Fyrir ykkur sem hafa verið að pæla hvað AM og PM þýðir þá er úskýringin hérna :)

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According to both NASA and the British Royal Observatory, a.m. stands for ante-meridiem, which is from Latin for “before the Sun has crossed the line.” And p.m. means post-meridiem, which is from Latin for “after the Sun has crossed the line.” But what line are they talking about? If you look on most world maps, you'll see horizontal latitude lines and vertical longitude lines. These lines allow you to pinpoint any place on Earth. The longitude lines are also called meridians. So if you're standing at a meridian line and the Sun is directly overhead, it's noon at that spot. Before it arrives overhead, it's a.m. After the sun is overhead, it's p.m. Our Time category has lots more information about how time is calculated!
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