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other uses|Midnight (disambiguation) Midnight is the transition time period from one day to the next: the moment when the date changes. In the Roman timekeeping system|Roman time system , midnight was halfway between sunset and sunrise , varying according to the season s.
Solar midnight is that time opposite of Noon#Solar_noon|solar noon , when the sun is closest to nadir and the night is equidistant from dusk and dawn. Due to the advent of time zone s, which make time identical across a range of meridian (geography)|meridian s, and daylight saving time , it rarely coincides with midnight on a clock. Solar midnight is dependent on longitude and time of the year rather than on a time zone.
In the northern hemisphere, "midnight" had an ancient geographic association with "north" (as did "noon" with "south" – see noon ). Modern Polish and Ukrainian preserve this association with their words for "midnight" ("pólnoc", "??????" – literally "half-night"), which also means "north".
Start and end of day
main|12-hour clock#Confusion at noon and midnightMidnight marks the beginning and ending of each day in civil time throughout the world. It is the dividing point between one day and another. With 12-hour clock|12-hour time notation , most authorities recommend avoiding confusion between noon and midnight by using "midnight", "12 midnight", or "12:00 midnight." http://www.nist.gov/pml/div688/faq.cfm NIST Time and Frequency miscellaneous FAQ
Digital clocks and computers commonly display 12 a.m. for midnight. While that phrase may be used practically, it helps to understand that any particular time is actually an instant. The "a.m." shown on clock displays refers to the 12-hour period following the instant of midnight, not to the instant itself. In other words, 11:59 p.m. shows until midnight; at the instant of midnight it changes to 12:00. Simultaneously, the p.m. changes to a.m., though, strictly speaking, a.m. does not apply to the instant of midnight which separates p.m. and a.m. In 24-hour clock|24-hour time notation , "0:00" and "0:00:00" refer to midnight at the start of a given date. Some styles, such as ISO 8601#Times|ISO 8601 , allow 24:00 to refer to the end of a day. Noon is 12:00:00.
While computers and digital clocks display "12:00 a.m." and "12:00 p.m.", those notations provide no clear and unambiguous way to distinguish between midnight and noon. It is actually grammatically incorrect to use "a.m." and "p.m." when referring to 12:00. The abbreviation a.m. stands for ante meridiem or before noon and p.m. stands for post meridiem or after noon . Since noon is neither after noon nor before noon, and midnight can equally be twelve hours before and after noon, neither abbreviation is correct (although the length of the error is determined by the smallest unit of time — 12:00:01 p.m. would be correctly notated).
The most common ways to represent these times are, (a) to use a 24-hour clock (0:00 and 12:00, 24:00), (b) to use "12 noon" or "12 midnight", although unless the person is referring to a general time and not a specific day, "12 midnight" is still ambiguous, (c) to specify the time between two successive days or dates (Midnight Saturday/Sunday or Midnight December 14/15), and (d) to use "12:01 a.m." or "11:59 p.m.," as is used where the ambiguity can have serious consequences, such as in contracts and the travel industry. http://www.nist.gov/pml/div688/times.cfm National Institute of Standards and Technology's Physical Measurement Laboratory
The thirtieth edition of the U.S. Government Style Manual (2008) sections 9.54 and 12.9b recommends the use of "12 a.m." for midnight and "12 p.m." for noon.cite web|url= http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi? dbname=2008_style_manual& docid=f:chapter9.wais|title=U.S. Government Printing Office Style Manual Chapter 9|year=2008|accessdate=2009-06-11cite web|url= http://frwebgate.access.gpo.gov/cgi-bin/getdoc.cgi? dbname=2008_style_manual& docid=f:chapter12.wais|title=U.S. Government Printing Office Style Manual Chapter 12|year=2008|accessdate=2009-06-11The 29th edition of the U.S. Government Printing Office Style Manual (2000) section 12.9 recommended the opposite the use of "12 p.m." for midnight and "12 a.m." (formerly "12 m.") for noon. Some religious calendars continue to begin the day at another time — for example, at dusk in the Hebrew calendar and the Islamic calendar .
