12-hour clock - Simple English Wikipedia, the free encyclopedia
A typical analog 12-hour clock The 12-hour clock is a way of dividing the 24 hours of the day into two sections. The two halves are called ante meridiem ( a.m.) and post meridiem ( p.m. ). Both names are from Latin, and numbered from 12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11. Time from midnight to noon is a.m. and from noon to midnight p.m.
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