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  2. List of date formats by country - Wikipedia

    en.wikipedia.org/wiki/List_of_date_formats_by...

    Federal regulations for shelf life dates on perishable goods mandate a year/month/day format, but allow the month to be written in full, in both official languages, or with a set of standardized two-letter bilingual codes such as 2019 AL 09 or 19 AL 09.

  3. Date and time representation by country - Wikipedia

    en.wikipedia.org/wiki/Date_and_time...

    The order in which the year, month, and day are represented. (Year-month-day, day-month-year, and month-day-year are the common combinations.) How weeks are identified (see seven-day week) Whether written months are identified by name, by number (1–12), or by Roman numeral (I-XII). Whether the 24-hour clock, 12-hour clock, or 6-hour clock is ...

  4. Date and time notation in the United States - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    The day-month-year order has been increasing in usage since the early 1980s. The month is usually written as an abbreviated name, as in "19 Jul 1942" (sometimes with hyphens). [5] Many genealogical databases and the Modern Language Association citation style use this format.

  5. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The Gregorian calendar year, which is in use as civil calendar in most of the world, begins on January 1 and ends on December 31. [1] It has a length of 365 days in an ordinary year but, in order to reconcile the calendar year with the astronomical cycle, it has 366 days in a leap year. With 97 leap years every 400 years, the Gregorian calendar ...

  6. Date and time notation in the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    Dates are traditionally and most commonly written in day–monthyear (DMY) order: [1] [2] 31 December 1999; 31/12/99; Formal style manuals discourage writing the day of the month as an ordinal number (for example "31st December"), except with an incomplete reference, such as "They set off on 12 August 1960 and arrived on the 18th".

  7. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    100 days, roughly equivalent to 1/4 of a year (91.25 days). In Chinese tradition "bǎi rì" is the hundredth day after one's birth, also called Baby's 100 Days Celebration. semester: 18 weeks: A division of the academic year. [6] Literally "six months", also used in this sense. lunar year: 354.37 d: year: 12 mo: 365 or 366 d: common year: 365 d

  8. Month - Wikipedia

    en.wikipedia.org/wiki/Month

    A month is a unit of time, used with calendars, that is approximately as long as a natural phase cycle of the Moon; the words month and Moon are cognates.The traditional concept of months arose with the cycle of Moon phases; such lunar months ("lunations") are synodic months and last approximately 29.53 days, making for roughly 12.37 such months in one Earth year.

  9. Wikipedia talk : Manual of Style/Dates and numbers/Archive 106

    en.wikipedia.org/wiki/Wikipedia_talk:Manual_of...

    Certain articles contain date ranges of the form day 1 –day 2 month year (albeit month day 1 –day 2, year). Blue lemon can't deal with this. For autoformatting to work this has to be written day 1 month–day 2 month year. We're trying to write English here: we shouldn't have to twist it to fit some ill-conceived formatting feature. I ...