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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. ... 12 AM denotes midnight and 12 PM denotes noon.
From midnight (12:00 AM) until 12:59 AM, swap the 12 for a zero. If you’re in military time and trying to translate back to the 12-hour system, any time that begins with zero is 12-something AM.
In these cases, exact and unambiguous communication of time is critical. If someone mistakes 5:00 AM for 5:00 PM in a hospital for example, when medication or other medical treatment is needed at a certain time, the outcome could be dire. Thus 24-hour time (5:00 PM written as 17:00) is used.
The term can also refer to a phenomenon where infants or young children cry for an extended period of time during the hour (or two) before their bedtime, becoming irritable and unwieldy with no known cause. [14] To reduce gun violence, curfew hours in Washington D.C. have been in force between 11:00 pm and 12:00 am to lower juvenile gunfire ...
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.
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.).
In American English, the term military time is a synonym for the 24-hour clock. [8] In the US, the time of day is customarily given almost exclusively using the 12-hour clock notation, which counts the hours of the day as 12, 1, ..., 11 with suffixes a.m. and p.m. distinguishing the two diurnal repetitions of this sequence.
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