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  2. Leap year - Wikipedia

    en.wikipedia.org/wiki/Leap_year

    Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100, but these centurial years are leap years if they are exactly divisible by 400. For example, the years 1700, 1800, and 1900 are not leap years, but the years 1600 and 2000 are. [8] 1800 calendar, showing that February had only 28 days

  3. 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 ...

  4. 1900 - Wikipedia

    en.wikipedia.org/wiki/1900

    1900 was an exceptional common year starting on Monday of the Gregorian calendar and a leap year starting on Saturday of the Julian calendar, the 1900th year of the Common Era (CE) and Anno Domini (AD) designations, the 900th year of the 2nd millennium, the 100th and last year of the 19th century, and the 1st year of the 1900s decade. As of the ...

  5. What is a leap year? Everything to know about February's ...

    www.aol.com/news/leap-everything-know-februarys...

    Here's the confusing part: According to the NIST, century leap years are only leap years if they can be evenly divided by 400. So, for example, 1700, 1800 and 1900 weren't leap years. And 2100?

  6. Why We Have Leap Years - AOL

    www.aol.com/why-leap-years-184323412.html

    That resulted in the years 1700, 1800, and 1900 losing their leap day, but 2000 adding one. Every other fourth year in all of these centuries would get it's Feb. 29. And with that the calendrical ...

  7. Why do we have a leap year? What would happen if we didn’t ...

    www.aol.com/why-leap-happen-didn-t-130000847.html

    He said the rule is if a “year is divisible by 100 and not divisible by 400,” then the leap year is skipped to adjust the time difference given to years with the extra day.

  8. Bissextus - Wikipedia

    en.wikipedia.org/wiki/Bissextus

    Bissext, or bissextus (from Latin bis 'twice' and sextus 'sixth') is the leap day which is added to the Julian calendar every fourth year and to the Gregorian calendar almost every fourth year to compensate for the almost six hour difference in length between a common calendar year of 365 days and the average length of the solar year.

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

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

    The year 2000 was a leap year, for example, but the years 1700, 1800, and 1900 were not. The next time a leap year will be skipped is the year 2100. ... The reason why the year is called a leap ...