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The leap year problem (also known as the leap year bug or the leap day bug) is a problem for both digital (computer-related) and non-digital documentation and data storage situations which results from errors in the calculation of which years are leap years, or from manipulating dates without regard to the difference between leap years and common years.
The template currently uses Wikimedia function time (#time). It is the same as if 4 mod year = 0 and 100 mod year ≠ 0, then not a leap year, unless 400 mod year = 0 ...
Excel includes February 29, 1900, incorrectly treating 1900 as a leap year, even though e.g. 2100 is correctly treated as a non-leap year. [ 82 ] [ 83 ] Thus, a formula counting dates between (for example) February 1, 1900 and March 1, 1900 will return an incorrect result.
The template currently uses Wikimedia function time (#time). It is the same as if 4 mod year = 0 and 100 mod year ≠ 0, then not a leap year, unless 400 mod year = 0 ...
A year may be a leap year if it is evenly divisible by 4. Years divisible by 100 (century years such as 1900 or 2000) cannot be leap years unless they are also divisible by 400. (For this reason ...
While most software (including Excel, JavaScript and R) currently recognizes 4000 and 8000 as leap years (as they are divisible by 400), SAS has adopted the "4000 year rule". Thus, with the current software, date conversions between SAS and other software will go out of sync after 28 February 4000.
Blocks that spell out Leap Year. If it seems like 2023 just flew by, we are at least in for a longer year in 2024. That's because 2024 is a leap year which means we gain a whole extra day.
Lotus 1-2-3 assumes that 1900 is a leap year. This is incorrect as while 1900 is a year that is divisible by four, years divisible by 100 are not counted as leap years unless divisible by 400. [ 90 ] This bug persists today as its competitor, Microsoft Excel, still incorporates the bug to ensure compatibility with legacy Lotus 1-2-3 spreadsheets.