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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
International standard ISO 8601 (Representation of dates and times) defines unambiguous written all-numeric big-endian formats for dates, such as 2022-12-31 for 31 December 2022, and time, such as 23:59:58 for 23 hours, 59 minutes, and 58 seconds.
[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 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.
Date and time notation in the United Kingdom records the date using the day–month–year format (31 December 1999, 31/12/99 or 31/12/1999). The time can be written using either the 24-hour clock (23:59) or the 12-hour clock (11:59 p.m.), either with a colon or a full stop (11.59 p.m.).
The current time in Darwin is 12:44 am on 4 December 2024 (use {{12-hour time|offset=9 hours 30 min}} not {{12-hour time|9.5}}) The default date format is day month year. For month day year use {{12-hour time|format=mdy}}, for example 3:14 pm on December 3, 2024; The default is not to show seconds or the day of the week. To display these use ...
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 ...
ISO 8601 is an international standard covering the worldwide exchange and communication of date and time-related data.It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1]