AM and PM: What Do They Mean? - timeanddate.com
https://www.timeanddate.com/time/am-and-pm.html
WEBFor example, 5 am is early in the morning, and 5 pm is late in the afternoon; 1 am is one hour after midnight, while 11 pm is one hour before midnight. Ante meridiem is commonly denoted as AM, am, a.m., or A.M.; post meridiem is usually abbreviated PM, pm, p.m., or P.M.
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