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mmm – three-letter abbreviation for month, e.g. Mar; mmmm – month spelled out in full, e.g. March; d – one-digit day of the month for days below 10, e.g. 2; dd – two-digit day of the month, e.g. 02; ddd – three-letter abbreviation for day of the week, e.g. Fri; dddd – day of the week spelled out in full, e.g. Friday; Separators of ...
BCE and CE or BC and AD are written in upper case, unspaced, without a full stop (period), and separated from the numeric year by a space (5 BC, not 5BC). It is advisable to use a non-breaking space. AD appears before or after a year (AD 106, 106 AD); BCE, CE, and BC always appear after (106 CE, 3700 BCE, 3700 BC).
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 ...
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]
The Chicago Manual of Style discourages writers from writing all-numeric dates, other than the year-month-day format advocated by ISO 8601, as it is not comprehensible to readers outside the United States. [5] [6] The day-month-year order has been increasing in usage since the early 1980s.
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 ...
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." [citation needed ...
Spacing: The letters of acronyms should not be spaced. Plurals: Plural acronyms are written with a lower-case s after the abbreviation, without an apostrophe, unless full points are used between the letters (e.g. ABCs or A.B.C.'s). Note that Wikipedia generally avoids using full point in upper-case acronyms.