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a.m. and p.m.

A day consists of twenty-four hours, but an analog clock consists of twelve hours. The term a.m. came into use to designate morning hours and the term p.m. to designate evening hours. Both terms are abbreviations of Latin phrases, a.m. is short for ante meridiem or before midday, and p.m. is short for post meridiem or after midday. Both a.m. and p.m. are properly written in lowercase with periods. Interestingly, the term p.m. was in use as early as the 1640s, but the term a.m. was not in use until the 1760s, though timekeeping in twelve-hour increments became standard in Europe a century earlier.  Today, twelve-hour clocks are still the norm and twenty-four hour clocks are mostly used for scientific and military reasons.


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Examples

The first explosion was reported at 10:50 a.m. in the car park of the Starbucks at the Skyline building adjacent to Sarinah, and was followed by six more blasts over the next 10 minutes, including at the police post at the intersection of Jalan Thamrin and Jalan K.H. Wahid Hasyim, according to witnesses. (The Jakarta Globe)

A frost advisory is in effect for portions of the Ventura County valleys until 9 a.m. Thursday, according to the National Weather Service. (The Ventura County Star)

The new IndyStar Call For Action consumer hotline is now closed but will reopen Friday from 11 a.m. to 1 p.m. (The Indianapolis Star)

WDJT-TV (Channel 58), which has been airing a half-hour 9 p.m. newscast on sister station WMLW, said Wednesday that it is expanding that show to a full hour, seven days a week. (The Milwaukee Journal Sentinel)

Winter weather advisory in effect until 7 p.m. for Stutsman County (The Jamestown Sun)

A Carey man was seriously injured when his car hit a tree at the intersection of Ohio 568 and Biglick Township 253, east of Findlay, at 2:29 p.m. Wednesday. (The Courier)

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