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The notation mainly serves to refer to the exact end of a day in a time interval. A typical usage is giving opening hours ending at midnight e.
Similarly, some bus and train timetables show as departure time and as arrival time. Legal contracts often run from the start date at until the end date at While the hour notation unambiguously distinguishes between midnight at the start and end of any given date, there is no commonly accepted distinction among users of the hour notation.
Style guides and military communication regulations in some English-speaking countries discourage the use of even in the hour notation, and recommend reporting times near midnight as or instead.
Time-of-day notations beyond such as or instead of or are not commonly used and not covered by the relevant standards.
However, they have been used occasionally in some special contexts in the United Kingdom, France, Spain, Canada, Japan, South Korea, Hong Kong, and China where business hours extend beyond midnight, such as broadcast television production and scheduling.
In most countries, computers by default show the time in hour notation. For example, Microsoft Windows and macOS activate the hour notation by default only if a computer is in a handful of specific language and region settings.
The hour system is commonly used in text-based interfaces. POSIX programs such as ls default to displaying timestamps in hour format. In American English , the term military time is a synonym for the hour clock.
The hour clock is commonly used there only in some specialist areas military, aviation, navigation, tourism, meteorology, astronomy, computing, logistics, emergency services, hospitals , where the ambiguities of the hour notation are deemed too inconvenient, cumbersome, or dangerous.
Military usage, as agreed between the United States and allied English-speaking military forces, [10] differs in some respects from other twenty-four-hour time systems:.
The hour time system has its origins in the Egyptian astronomical system of decans , and has been used for centuries by scientists, astronomers, navigators, and horologists.
In East Asia , time notation was hour before westernization in modern times. There are many surviving examples of clocks built using the hour system, including the famous Orloj in Prague , and the Shepherd Gate Clock at Greenwich.
The first mechanical public clocks introduced in Italy were mechanical hour clocks which counted the 24 hours of the day from one-half hour after sundown to the evening of the following day.
The 24th hour was the last hour of day time. After missing a train while travelling in Ireland in because a printed schedule listed p.
Rutherfurd proposed:. That this universal day is to be a mean solar day; is to begin for all the world at the moment of midnight of the initial meridian coinciding with the beginning of the civil day and date of that meridian, and is to be counted from zero up to twenty-four hours.
This resolution was adopted by the conference. A report by a government committee in the United Kingdom noted Italy as the first country among those mentioned to adopt hour time nationally, in By the early s, many countries in Latin America had also adopted the hour clock.
During World War I , the British Royal Navy adopted the hour clock in , and the Allied armed forces followed soon after, [18] with the British Army switching officially in The use of the hour clock in the United Kingdom has grown steadily since the beginning of the 20th century, although attempts to make the system official failed more than once.
The experiment was halted after five months following a lack of enthusiasm from the public, and the BBC continued using the hour clock.
From Wikipedia, the free encyclopedia. Timekeeping convention. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources.
Unsourced material may be challenged and removed. Government Printing Office, Style Manual. Archived from the original on Retrieved International Organization for Standardization , 3rd ed.
Dosage calculations 2nd Canadian ed. Toronto: Nelson Education. Expressing Military Time. June Lexico UK Dictionary.
Oxford University Press. Archived from the original PDF on Bibcode : Metro.. A usage example showing the 12 hour clock vs military time would be a time table showing pm to midnight.
This would be written as — Another example highlighting the difference between the two would be to show that am is written as in military time but pm is written as This method of keeping time is most commonly used by the military, government, public transportation, hospitals, meteorologists, astronomers, those employed in emergency services, and also with computers.
Also, in the military, these time stamps are often written without the colon, so would rather be written Each of the zones have a corresponding letter and name.
Military Time Converter. Other top posts:. References: Wikipedia: 24 hour clock. Military Time Chart.
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