AM and PM: What Do They Mean? - timeanddate.com
https://www.timeanddate.com/time/am-and-pm.html
WEBAnte meridiem is commonly denoted as AM, am, a.m., or A.M.; post meridiem is usually abbreviated PM, pm, p.m., or P.M. Like many other sources, timeanddate.com uses am and pm, but the other variants are equally correct and widely used. What is solar noon? Midnight and Noon: AM or PM?
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