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  2. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    Since in the Gregorian calendar there are 146,097 days, or exactly 20,871 seven-day weeks, in 400 years, the anchor day repeats every four centuries. For example, the anchor day of 1700–1799 is the same as the anchor day of 2100–2199, i.e. Sunday. The full 400-year cycle of doomsdays is given in the adjacent table.

  3. Conversion between Julian and Gregorian calendars - Wikipedia

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

    Years affected are those which divide by 100 without remainder but do not divide by 400 without remainder (e.g., 1900 and 2100 but not 2000). No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates).

  4. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    Microsoft Excel displays the day before January 1, 1900 (the earliest date it can represent) as January 0, 1900. [17] It also treats 1900 incorrectly as a leap year (whereas only centuries divisible by 400 are), so it displays the day before March 1, 1900 as the non-existent February 29 instead of February 28. This means March 1, 1900 is the ...

  5. List of years - Wikipedia

    en.wikipedia.org/wiki/List_of_years

    This page was last edited on 19 January 2025, at 19:53 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  6. February 29 - Wikipedia

    en.wikipedia.org/wiki/February_29

    For example, 1900 was not a leap year, but 2000 was. The Julian calendar—since 1923 a liturgical calendar—has a February 29 every fourth year without exception. Consequently, February 29 in the Julian calendar, since 1900, falls 13 days later than February 29 in the Gregorian, until the year 2100. [1]

  7. 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.

  8. What’s the point of a Leap Year? Why 2024 brings 29 days of ...

    www.aol.com/point-leap-why-2024-brings-192452163...

    Each calendar year is typically 365 days long, with the idea that it takes that many days for the Earth to make one complete rotation around the sun. ... but the years 1700, 1800, and 1900 were ...

  9. Century common year - Wikipedia

    en.wikipedia.org/wiki/Century_common_year

    The years 1800 and 1900 were also century common years, and so will be 2100, 2200, 2300, 2500, 2600, 2700, 2900, and 3000. The Gregorian Calendar repeats itself every 400 years, so century common years start on a Friday if the remainder obtained when dividing the year by 400 is 100 (dominical letter C), Wednesday if the remainder is 200 ...