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24-hour digital clock in Miaoli HSR station. A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of ...
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 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).
ISO 8601 uses the 24-hour clock system. As of ISO 8601-1:2019, the basic format is T[hh][mm][ss] and the extended format is T[hh]:[mm]:[ss]. Earlier versions omitted the T (representing time) in both formats. [hh] refers to a zero-padded hour between 00 and 24. [mm] refers to a zero-padded minute between 00 and 59.
The date and time in Australia are most commonly recorded using the day–month–year format (2 January 2025) and the 12-hour clock (3:46 am), although 24-hour time is used in some cases. For example, some public transport operators such as V/Line [1] and Transport NSW [2] use 24-hour time, although others use 12-hour time instead.
The relative phrases are exclusive to the 12-hour clock, just as the "(hour) Uhr (minutes)" format is exclusive to the 24-hour clock. For hours greater than 12 and non-zero minutes, "Uhr" is sometimes omitted, especially for the half hours between 13:30 and 19:30.
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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. [27] It is not the recommended style in journalism, for example. [28] This situation is similar to the use of the 24-hour clock in the United Kingdom.