12-hour clock

:"A.M." redirects here; for the modulation technique, see Amplitude modulation.

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The 12-hour clock is a timekeeping convention in which the 24 hours of the day are divided into two periods called ante meridiem ({{AM}}, Latin for "before noon") and post meridiem ({{PM}}, Latin for "after noon"). Each period consists of 12 hours numbered 12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11. The {{AM}} period runs from midnight to noon, while the {{PM}} period runs from noon to midnight.

Related Topics:
Timekeeping - Hour - Day - Latin - Midnight - Noon

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The 12-hour clock is especially common in the United States of America, Anglophone areas of Canada, the United Kingdom, some other English-speaking regions, some of the Spanish-speaking regions of South America, Albania and Greece. The Latin abbreviations "A.M." and "P.M." are used in the English, Spanish, and Swahili forms of the 12-hour notation. In Albanian, the equivalents are "PD" and "MD", and in Greek they are "?µ" and "µµ". Most other languages lack formal abbreviations for "before noon" and "after noon" and there people use the 12-hour clock only verbally and informally.

Related Topics:
United States of America - Canada - United Kingdom

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