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  2. 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.

  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. 1444 - Wikipedia

    en.wikipedia.org/wiki/1444

    1444 was a leap year starting on Wednesday of the Julian calendar, the 1444th year of the Common Era (CE) and Anno Domini (AD) designations, the 444th year of the 2nd millennium, the 44th year of the 15th century, and the 5th year of the 1440s decade. As of the start of 1444, the Gregorian calendar was 9 days ahead of the Julian calendar, which ...

  5. List of Islamic years - Wikipedia

    en.wikipedia.org/wiki/List_of_Islamic_years

    This is a list of Hijri years (Latin: anno Hegirae or AH) with the corresponding common era years where applicable. For Hijri years since 1297 AH (1879/1881 CE), the Gregorian date of 1 Muharram, the first day of the year in the Islamic calendar, is given.

  6. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The Gregorian calendar was implemented in Russia on 14 February 1918 by dropping the Julian dates of 1–13 February 1918, [h] pursuant to a Sovnarkom decree signed 24 January 1918 (Julian) by Vladimir Lenin. The decree required that the Julian date was to be written in parentheses after the Gregorian date, until 1 July 1918. [19]

  7. List of adoption dates of the Gregorian calendar by country

    en.wikipedia.org/wiki/List_of_adoption_dates_of...

    11 Egypt: Egypt 1875 6 Epag. 11 Sept N/A Previously used the Alexandrian calendar for fiscal purposes [14] Estonia: Estonia: 1918 15 Feb 1 Mar 13 Faroe Islands: Norway: 1700 16 Nov 28 Nov 11 France: France: 1582 9 Dec 20 Dec 10 Excluding Alsace and Lorraine [11] [12] [15] France: France: 1793 23 Sep 3 Vend. (II) N/A Introduction of the French ...

  8. List of date formats by country - Wikipedia

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

    For instance, depending on the order style, the abbreviated date "01/11/06" can be interpreted as "1 November 2006" for DMY, "January 11, 2006" for MDY, and "2001 November 6" for YMD. The ISO 8601 format YYYY-MM-DD (2025-01-23) is intended to harmonize these formats and ensure accuracy in all situations.

  9. Talk:Egyptian calendar - Wikipedia

    en.wikipedia.org/wiki/Talk:Egyptian_calendar

    In 2782 BC it is June 27 Gregorian, in 1322 BC it is July 8 Gregorian, and in 139 AD it is July 19 Gregorian. The next Coptic New Year (Tut 1) will be September 12, 2011 Gregorian (and August 30 Julian) because it is one day after the Coptic leap day (6 al-Nasi) and six months before the next Julian leap day on February 30, 2012.