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Alternatively, noon may be written as 午前12時 (12 a.m.) and midnight at the end of the day as 午後12時 (12 p.m.), as opposed to 午前0時 (0 a.m.) for the start of the day, making the Japanese convention the opposite of the English usage of 12 a.m. and 12 p.m. [29]
Civilian format: spelled out month, 1-or 2-digit day, a comma, and the 4-digit year (e.g. February 4, 2023). [12] Date Time Group format, used most often in operation orders. This format uses DDHHMMZMONYY, with DD being the two-digit day, HHMM being the time on a 24-hour clock, Z being the timezone code, MON being the three-letter month, and YY ...
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.
The day starts at 12:00 am. Later we get 12:01 am, 12:59 am, 1:00 am, . . ., 11:59 am, 12:00 pm, 1:00 pm, . . ., 11:59 pm, 12:00 am. The most logical, the most-often used, and in fact, the de facto convention is that 12am is midnight at the beginning of the day and 12pm is noon. Every digital clock I've ever seen, including embedded systems ...
The winter solstice marks the shortest day and longest night of the year, according to the National Weather Service. This occurs due to the Earth's tilt from the sun.
"However, it has become common practice in countries that use the system (such as the United States) to define 12:00 am as the midnight at the beginning of the day (equivalent to 00:00 in the 24-hour notation) and 12:00 pm as noon (equivalent to 12:00 in the 24-hour notation)." So, 12:00 am is ambiguous _only_ without the de facto convention.
For the more than 6 billion people living in the Northern Hemisphere, this astronomical event signals not only the shortest day but also the longest night of the year.
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. This was a period of prayer ...