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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").
The AM/PM system actually does have a specific abbreviation for noon—just the letter “M,” short for “meridiem,” which would come after “12” and only refer to noon. Haven’t heard of it?
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.).
A day is the time period of a full rotation of the Earth with respect to the Sun.On average, this is 24 hours (86,400 seconds).As a day passes at a given location it experiences morning, afternoon, evening, and night.
The date and time in Australia are most commonly recorded using the day–month–year format (25 February 2025) and the 12-hour clock (2:49 pm), 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.
PM or pm (also written P.M. or p.m.) is an abbreviation for Latin post meridiem, meaning "after midday" in the 12-hour clock. PM or Pm or pm may also refer to:
PM was later introduced to ABC Radio 2 (now ABC Radio National) with a new early edition at 5:10 pm after the 5:00 pm news. [citation needed] PM was originally 20 minutes long before expansion to 50 minutes in 1987. In 2018 it reduced to a 25 minute format, which matched AM. [2]
In Vietnam, dates follow the "day month year" order. All-numeric dates can be written as: [1] d/m/yyyy (9/1/2021) d-m-yyyy (9-1-2021) dd/mm/yyyy (09/01/2021)