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Whether the 24-hour clock, 12-hour clock, or 6-hour clock is used. Whether the minutes (or fraction of an hour) after the previous hour or until the following hour is used in spoken language. The punctuation used to separate elements in all-numeric dates and times. Which days are considered the weekend.
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.
John Harrison, Thomas Tompion, and Mudge [7] built a number of clocks with 24-hour analog dials, particularly when building astronomical and nautical instruments. 24-hour dials were also used on sidereal clocks. The famous Big Ben clock in London has a 24-hour dial as part of the mechanism, although it is not visible from the outside. [8]
The 24-hour clock is used in military, public safety, and scientific contexts in the United States. [4] It is best known for its use by the military and is therefore commonly called "military time". In U.S. military use, 24-hour time is traditionally written without a colon (1800 instead of 18:00).
In speech, a time given in 24-hour format is always followed by the word horas: el concierto comenzará a las 15:30 "quince y treinta" horas ("the concert will start at 15:30"). Fractional seconds are given in decimal notation, with punctuation marks used to separate the units of time (full stop, comma or single quotation marks ).
Hour: The next two rows of 8 light switches are the hour mark, using a similar BCD system, where the upper row is a multiplier of 5, and the lower row is a multiplier of 1. Therefore the maximum hour number is 4*5+4=24 and the minimal hour number is 0 where everything is OFF. Since a 24-hour clock uses a number from 0-23.
When the 24-hour clock is used in spoken language, which is not quite common, usually the written form is pronounced with the hours as a number, the word "uur" (hour) and the minutes as a number. For example, 17:21 might be pronounced as "zeventien uur eenentwintig" (seventeen hours twenty-one). Hours over 12 are not usually combined with ...
The government describes the 24-hour system as "desirable" but does not enforce its use, meaning that the 12-hour clock remains common for oral and informal usage in English-speaking contexts. [29] It is not the recommended style in journalism, for example. [30] This situation is similar to the use of the 24-hour clock in the United Kingdom.