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In the 24-hour time notation, the day begins at midnight, 00:00 or 0:00, and the last minute of the day begins at 23:59. Where convenient, the notation 24:00 may also be used to refer to midnight at the end of a given date [3] — that is, 24:00 of one day is the same time as 00:00 of the following day.
It accepts one optional unnamed parameter. If the parameter is absent or neither a valid time nor number, the template returns the UTC at the time the page was generated. {{24 h to 12 h}} → 5:00 pm {{24 h to 12 h|foo}} → 5:00 pm; The parameter can be a plain hour. {{24 h to 12 h|00}} → 12 midnight {{24 h to 12 h|0}} → 12 midnight
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
In traditional American usage, dates are written in the month–day–year order (e.g. February 17, 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 (3:47 pm). International date and time formats typically follow the ISO 8601 format (2025-02-17) for all-numeric dates, [3] write ...
The 24-hour clock is the most commonly used method worldwide to physically represent the time of day. Some regions utilize 24-hour time notation in casual speech as well, such as regions that speak German, French, or Romanian, though this is less common overall; other countries that utilize the 24-hour clock for displaying time physically may ...
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".
A sundial showing all 24 hours; impractical but symmetrical Shepherd Gate clock outside the Royal Observatory, Greenwich The clock at Ottery St Mary, England, showing nearly noon, using the 12-hour time system on a 24-hour analog dial The 24-hour tower clock in Venice that uses double-XII system
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.).