1900 Leap facts
While investigating facts about 1900 Leap, I found out little known, but curios details like:
Leap years don't actually happen every four years. Leap days are added in years divisible by four, unless the year is also divisible by 100. If the year is also divisible by 400, a leap day is added regardless. So 1900, not a leap year.
A century year cannot be a leap year unless it is divisible by 400. Thus 1700, 1800, and 1900 were not leap years, but 1600, 2000, and 2400 are leap years
In my opinion, it is useful to put together a list of the most interesting details from trusted sources that I've come across. Here are 7 of the best facts about 1900 Leap I managed to collect.
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1900 and 2100 are not leap years, and so are the years that are divisible by 100 but not by 400.
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Microsoft Excel incorrectly assumes that the year 1900 is a leap year and it's better not to fix it
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Our system for correcting calendar drift is imperfect. To compensate, if the year is a multiple of 100, it is not considered a leap year, but if it is a multiple of 400, then it is considered a leap year. (1900->not leap year, 2000->leap year, 2100->not leap year)
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MS Excel treats 1900 as a leap year (even though it wasn't) since it was easier to do that in the 1988 version, and they never updated it because of backwards compatibility, it would cause more problem than it would fix, and almost no one tracks 1900 and before.
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Leap years occur every 4 years EXCEPT when the year is divisible by 100, UNLESS that year is also divisible by 400. So the years 1700, 1800, and 1900 weren't leap years, but 2000 was.
