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All examples use example date 2021-03-31 / 2021 March 31 / 31 March 2021 / March 31, 2021 – except where a single-digit day is illustrated. Basic components of a calendar date for the most common calendar systems: D – day; M – month; Y – year; Specific formats for the basic components: yy – two-digit year, e.g. 24; yyyy – four-digit ...
Years could be written with two or four digits; the century was sometimes seen being replaced by an apostrophe: "31.12.'91"; however, two-digit years are generally deprecated after the Millennium. Numbers may be written with or without leading zero in Austria or Switzerland, where they are commonly only discarded in days when literal months are ...
The U.S. military sometimes uses a system, known to them as the "Julian date format", [16] which indicates the year and the actual day out of the 365 days of the year (and thus a designation of the month would not be needed). For example, "11 December 1999" can be written in some contexts as "1999345" or "99345", for the 345th day of 1999. [17]
In written and spoken language, a date or year is preceded by the definite article (with or without the preposition "in"): [4] il 2 giugno 1992 or nel 2 giugno 1992; l'8 marzo 2010 or nell'8 marzo 2020; il 1985 o nel 1985; l'85 o nell'85; The first day of the month is usually written 1º dicembre or 1° dicembre; 1 dicembre is possible [2] but ...
Times relative to the designation are indicated with +/−[Arabic numeral] after the letter, replacing -day or -hour with a count of the same unit: "D−1" (the day before D-Day), "L+9" (9 hours after L-Hour) etc. [citation needed] In less formal contexts, the symbol or numeral may be spelled out: "D minus 1" or "L plus nine."
Where several times that are all a.m. or all p.m. appear in close proximity, then a.m. or p.m. need be given only once if there is no risk of confusion. 24-hour clock times have no a.m., p.m., noon or midnight suffix, and include a colon (15:30 not 1530). Hours under 10 should have a leading zero (08:15).
Months, days of the week, and holidays start with a capital letter (June, Monday; the Fourth of July refers only to the US Independence Day – otherwise July 4 or 4 July). Seasons are in lower case ( her last summer ; the winter solstice ; spring fever ), except in personifications or in proper names for periods or events ( Old Man Winter ...
Mission control center's board with time data, displaying coordinated universal time with ordinal date (without year) prepended, on October 22, 2013 (i.e.2013-295). An ordinal date is a calendar date typically consisting of a year and an ordinal number, ranging between 1 and 366 (starting on January 1), representing the multiples of a day, called day of the year or ordinal day number (also ...