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Official documents, however, always include all four digits. In Spanish, the suffixes for BC and AD are "AC" (antes de Cristo, "before Christ") and "DC" (después de Cristo, "after Christ"), respectively. "AD" for "Anno Domini" in Latin is sometimes used instead of "DC", but it is rare. "DC" is commonly omitted for years after 200 AD.
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]
Punctuation and spacing styles differ, even within English-speaking countries (6:30 p.m., 6:30 pm, 6:30 PM, 6.30pm, etc.). [ citation needed ] Most people who live in countries that use one of the clocks dominantly are still able to understand both systems without much confusion; the statements "three o'clock" and "15:00", for example, are ...
Noon (also known as noontime or midday) is 12 o'clock in the daytime. It is written as 12 noon, 12:00 m. (for meridiem, literally 12:00 midday), 12 p.m. (for post meridiem, literally "after midday"), 12 pm, or 12:00 (using a 24-hour clock) or 1200 (military time). Solar noon is the time when the Sun appears to contact the local celestial meridian.
Hours between 1 and 10 have their leading zero spoken as "oh", as in "oh eight thirty" to mean 8:30 a.m., although 00:30 would be "zero thirty". The Army adds the word "hours" after the military time (e.g. "eighteen hundred hours"), including for times not on the hour mark (e.g. "sixteen thirty hours"); however, the Navy and Marine Corps do not ...
[23] [24] The 24-hour notation is shorter, removes the potential for confusing the first and second halves of the day especially visible at midnight (00:00 or 24:00, 12:00 a.m.) and noon (12:00, 12:00 p.m.), and is language-neutral. [25] English speakers use both the 24- and 12-hour clocks.
German (Gallic) hours (half-dial): 2×12 hour system starting at midnight and restarted at noon. It is typical with the 12-hour dial with 12 at the top. The modern 24-hour system is a late-19th century adaptation of the German midnight-starting system, and then prevailed in the world with the exception of some Anglophone countries.
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.