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The 12-hour clock is a time convention in which the 24 hours of the day are ... In spoken English, full hours are often represented by the numbered hour ...
In most English-speaking regions, the 12-hour clock is the predominant form of representing the time of day physically, while the 24-hour clock is generally used for contexts where unambiguity and accurate timekeeping are important, such as for public transport schedules.
The time of day is typically expressed in English in terms of hours. Whole hours on a 12-hour clock are expressed using the contracted phrase o'clock, from the older of the clock. [6] (10 am and 10 pm are both read as "ten o'clock".) Hours on a 24-hour clock ("military time") are expressed as "hundred" or "hundred hours".
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).
The 24-hour notation is used in timetables and on most digital clocks, but 12-hour notation is still widely used in ordinary life. The 24-hour notation is used more often than in North America – transport timetables use it exclusively, as do most legal documents – but not as commonly as in much of the non-English-speaking world.
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Note: As in English, these time-frame phrases are used only with the 12-hour system. Time can alternatively be expressed as a fraction of the hour. A traditional Chinese unit of time , the kè ( 刻 ), was 1/96 of the 24-hour day, equivalent mathematically to 15 minutes and semantically to the English "quarter of an hour".
The date and time in Australia are most commonly recorded using the day–month–year format (25 December 2024) and the 12-hour clock (7:39 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.