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  2. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    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").

  3. Date and time notation in the United States - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    The 24-hour notation is also widely used by astronomers, hospitals, public safety personnel (police, fire department, EMS), various forms of transportation, and at radio and other broadcast media outlets behind the scenes where scheduling programming needs to be exact, without mistaking AM and PM. In these cases, exact and unambiguous ...

  4. Hour - Wikipedia

    en.wikipedia.org/wiki/Hour

    Midnight to 1 a.m. on a 24-hour clock with a digital face. An hour (symbol: h; [1] also abbreviated hr) is a unit of time historically reckoned as 1 ⁄ 24 of a day and defined contemporarily as exactly 3,600 seconds . There are 60 minutes in an hour, and 24 hours in a day.

  5. Roman timekeeping - Wikipedia

    en.wikipedia.org/wiki/Roman_timekeeping

    The daytime canonical hours of the Catholic Church take their names from the Roman clock: the prime, terce, sext and none occur during the first (prīma) = 6 am, third (tertia) = 9 am, sixth (sexta) = 12 pm, and ninth (nōna) = 3 pm, hours of the day. The English term noon is also derived from the ninth hour.

  6. Date and time notation in South Korea - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    Half past the hour is commonly—especially in spoken Korean—abbreviated as 반 ban, which literally means “half”; for example, 13:30 is either expressed as “ 오후 1시 30분 ” or “ 오후 1시 반 ”. When the time is expressed in the HH:MM:SS notation, the Roman ante/post-meridiem indicators (AM and PM) are also used frequently.

  7. 12:00 a.m. – 1:00 a.m. - Wikipedia

    en.wikipedia.org/wiki/12:00_a.m._–_1:00_a.m.

    Senator David Palmer is preparing for a 7 AM speech when he gets a call from a journalist named Maureen Kingsley. His wife, Sherry, overhears him lose his temper with the journalist. When Sherry asks what the journalist said, David halfheartedly assuages her and walks out onto his hotel balcony to look over the city.

  8. Striking clock - Wikipedia

    en.wikipedia.org/wiki/Striking_clock

    The Kremlin Clock on the Moscow Kremlin rings in 2012.. The most basic sort of striking clock simply sounds a bell once every hour; this is called a passing strike clock. . Passing strike was simple to implement mechanically; all that must be done is to attach a cam to a shaft that rotates once per hour; the cam raises and then lets a hammer fall that strikes t

  9. Date and time notation in Australia - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    The date and time in Australia are most commonly recorded using the day–month–year format (22 February 2025) and the 12-hour clock (9:23 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.