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The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated by the hours (and minutes) passed since midnight, from 00(:00) to 23(:59) , with 24(:00) as an option to indicate the end of the day.
Sistema horario de 24 horas; Usage on ja.wikipedia.org 午前と午後; 24時制; Usage on no.wikipedia.org Digital kalender; Usage on ru.wikipedia.org 24-часовой формат времени; Usage on simple.wikipedia.org 24-hour clock; 12-hour clock; Usage on zh.wikipedia.org 二十四小時制
The only other widely used clock face today is the 24 hour analog dial, because of the use of 24 hour time in military organizations and timetables. Before the modern clock face was standardized during the Industrial Revolution , many other face designs were used throughout the years, including dials divided into 6, 8, 10, and 24 hours.
Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time. Most digital clocks display the hour of the day in 24-hour format; in the United States and a few other countries, a commonly used hour sequence option is 12-hour format (with some indication of AM or PM).
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This first shí traditionally occurred from 23:00 to 01:00 on the 24-hour clock, but was changed during the Song dynasty so that it fell from 00:00 to 02:00, with midnight at the beginning. [ 2 ] Starting from the end of the Tang dynasty into the Song dynasty, each shí was divided in half, with the first half called the initial hour ( 初 ...
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