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  2. Conversion between Julian and Gregorian calendars - Wikipedia

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

    Within these tables, January 1 is always the first day of the year. 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.

  3. Template:Comparison of Revised Julian and Gregorian calendar ...

    en.wikipedia.org/wiki/Template:Comparison_of...

    year Remain-der on divide by 900 Is a Revised Julian leap year Is a Grego-rian leap year Revised Julian is same as Grego-rian 1000: 100 1100: 200 1200: 300 1300: 400 1400: 500 1500: 600 1600: 700 1700 800 1800 0 1900 100 2000 200 2100 300 2200 400 2300 500 2400 600 2500 700 2600 800 2700 0 2800: 100 2900: 200 3000: 300 3100: 400 3200: 500 3300: ...

  4. 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.

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

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

    There are only four countries which have not adopted the Gregorian calendar for civil use: Ethiopia (Ethiopian calendar), Nepal (Vikram Samvat and Nepal Sambat), Iran (Solar Hijri calendar) [1] and Afghanistan (Lunar Hijri Calendar). [2] Thailand has adopted the Gregorian calendar for days and months, but uses its own era for years: the ...

  6. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    The table is filled in horizontally, skipping one column for each leap year. This table cycles every 28 years, except in the Gregorian calendar on years that are a multiple of 100 (such as 1800, 1900, and 2100 which are not leap years) that are not also a multiple of 400 (like 2000 which is still a leap year).

  7. Template:Ab urbe condita date - Wikipedia

    en.wikipedia.org/wiki/Template:Ab_urbe_condita_date

    alone: Display only the number of years and the calendar era according to the |main= parameter : E.g.: "AUC 964" number: Display only a natural number without any era: If |1= is a Gregorian year, the number returned equals the value of that year in the astronomical calendar plus 753; if |1= is an year Ab Urbe Condita, the number returned equals exactly the value of that year in the ...

  8. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...

  9. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    The formulae can be used proleptically, but "Year 0" is in fact year 1 BC (see astronomical year numbering). The Julian calendar is in fact proleptic right up to 1 March AD 4 owing to mismanagement in Rome (but not Egypt) in the period since the calendar was put into effect on 1 January 45 BC (which was not a leap year).