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  2. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The issue spans the changeover; the date heading reads: "From Tuesday September 1, O.S. to Saturday September 16, N.S. 1752". [ 1] Old Style ( O.S.) and New Style ( N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in ...

  3. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  4. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    The Gregorian calendar did not exist before October 15, 1582. Gregorian dates before that are proleptic, that is, using the Gregorian rules to reckon backward from October 15, 1582. Years are given in astronomical year numbering. Augustus corrected errors in the observance of leap years by omitting leap days until AD 8.

  5. Proleptic Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Proleptic_Gregorian_calendar

    The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to the dates preceding its official introduction in 1582. In nations that adopted the Gregorian calendar after its official and first introduction, dates occurring in the interim period of 15 October 1582 (the first date of use of Gregorian calendrical dates, being dated 5 October 1582 in the preceding ...

  6. October - Wikipedia

    en.wikipedia.org/wiki/October

    October is the tenth month of the year in the Julian and Gregorian calendars. Its length is 31 days. Its length is 31 days. The eighth month in the old calendar of Romulus c. 750 BC , October retained its name (from Latin and Greek ôctō meaning "eight") after January and February were inserted into the calendar that had originally been ...

  7. List of date formats by country - Wikipedia

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

    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 ...

  8. Adoption of the Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Adoption_of_the_Gregorian...

    Through enactment of the Calendar (New Style) Act 1750, Great Britain and its possessions (including parts of what is now the United States) adopted the Gregorian calendar in 1752, by which time it was necessary to correct by 11 days. Wednesday, 2 September 1752, was followed by Thursday, 14 September 1752.

  9. 2014 - Wikipedia

    en.wikipedia.org/wiki/2014

    2014 ( MMXIV) was a common year starting on Wednesday of the Gregorian calendar, the 2014th year of the Common Era (CE) and Anno Domini (AD) designations, the 14th year of the 3rd millennium and the 21st century, and the 5th year of the 2010s decade. 2014 was designated as: