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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 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before midday") and p.m. (from Latin post meridiem, translating to "after midday"). [1] [2] Each period consists of 12 hours numbered: 12 (acting as 0), [3] 1, 2, 3, 4
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 ...
[12] Date Time Group format, used most often in operation orders. This format uses DDHHMMZMONYY, with DD being the two-digit day, HHMM being the time on a 24-hour clock, Z being the timezone code, MON being the three-letter month, and YY being the two-digit year. For example, 041200ZFEB23 is noon, UTC, on 4 Feb 2023. [13]
The BBC has been using 24-hour notation in its online radio and TV guides for many years, as do ITV and Channel 5, though Channel 4 still maintains 12-hour notation. [citation needed] It is rare to use the 24-hour format when speaking; 21:30 is colloquially spoken as "half past nine" or "nine thirty" rather than "twenty-one thirty".
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.
To avoid confusion, time on schedules and public notices are typically formatted in the 24-hour system, so the times 19:45 and 07:45 are understood to be 12 hours apart from each other. Spoken Chinese predominantly uses the 12-hour system and follows the same concept as A.M. (上午; shàngwǔ) and P.M. (下午; xiàwǔ). However, these ...
24-hour time: 02:24:01: ... This time format was proposed by the Swedish-American engineer John W. Nystrom in 1863 ... Archived from the original on 2022-12-24 ...