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The American Heritage Dictionary of the English Language states "By convention, 12 AM denotes midnight and 12 PM denotes noon. Because of the potential for confusion, it is advisable to use 12 noon and 12 midnight". [34] E. G. Richards in his book Mapping Time (1999) provided a diagram in which 12 a.m. means noon and 12 p.m. means midnight. [35]
There are multiple times that can be considered the witching hour. Some claim the time is between 12:00 am and 1:00 am, while others claim there is increased supernatural activity between sunset and sunrise. The New Zealand Oxford Dictionary identifies midnight as the time when witches are supposedly active. [2]
The 30th edition of the U.S. Government Style Manual (2008), in sections 9.54 and 12.9b, recommended the use of "12 a.m." for midnight and "12 p.m." for noon. [3] [4] However, the previous 29th edition of the U.S. Government Printing Office Style Manual (2000), in section 12.9, recommended the opposite. There is no further record documenting ...
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.
As the source and comment above show, the convention used in TV, radio, etc that uses 0 PM for noon follows "how it's taught in school" and is actually a logical extension of the legal one that uses 0 AM (午前0時) for midnight but 12 AM (午前12時) for noon (although at least one regulation exists that used 午後零時, i.e. 0 PM; see ja ...
Sundays: 10:00 am to 4:00 pm, or 11:00 am to 5:00 pm, or 12 noon to 6:00 pm. Sunday shopping has become more popular, and most but not all shops in towns and cities are open for business. Shops 280 m 2 and larger in England and Wales are allowed to trade for only six hours on Sundays; shops in Northern Ireland may open from 1:00 pm to 6:00 pm.
The English term noon is also derived from the ninth hour. This was a period of prayer initially held at three in the afternoon but eventually moved back to midday for unknown reasons. [12] The change of meaning was complete by around 1300. [13] The terms a.m. and p.m. are still used in the 12-hour clock, as opposed to the 24-hour clock.
In the modern 12-hour clock, counting the hours starts at midnight and restarts at noon. Hours are numbered 12, 1, 2, ..., 11. Hours are numbered 12, 1, 2, ..., 11. Solar noon is always close to 12 noon (ignoring artificial adjustments due to time zones and daylight saving time ), differing according to the equation of time by as much as ...