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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.
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 ...
Date and time notation around the world varies.. An approach to harmonize the different notations is the ISO 8601 standard.. Since the Internet is a main enabler of communication between people with different date notation backgrounds, and software is used to facilitate the communication, RFC standards and a W3C tips and discussion paper were published.
In traditional American usage, dates are written in the month–day–year order (e.g. January 24, 2025) with a comma before and after the year if it is not at the end of a sentence [2] and time in 12-hour notation (12:27 am). International date and time formats typically follow the ISO 8601 format (2025-01-24) for all-numeric dates, [3] write ...
In spoken language, the 24-hour clock has become the dominant form during the second half of the 20th century [citation needed], especially for formal announcements and exact points in time. Systematic use of the 24-hour clock by German radio and TV announcers, along with the proliferation of digital clocks, may have been a significant factor ...
When giving exact times, or when speaking in official settings (radio, TV, etc.), the 24-hour clock is always used. News programs often use the 24-hour clock in their very names, including Atten tretti / Dagsnytt Atten, Redaksjon 21 and Sytten Tretti. Entertainment shows like Halvsju have on the other hand been named after the 12-hour clock.
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This also works when a time in 24-hour format is included after the date, as long as all times are understood to be in the same time zone. ISO 8601 is used widely where concise, human-readable yet easily computable and unambiguous dates are required, although many applications store dates internally as UNIX time and only convert to ISO 8601 for ...