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  2. Leap year problem - Wikipedia

    en.wikipedia.org/wiki/Leap_year_problem

    The following Windows C++ code is an example of a Category 1 leap year bug. It will work properly until the current date becomes February 29 of a leap year. Then, it will modify st to represent February 29 of a common year, a date which does not actually exist. Passing st to any function that accepts a SYSTEMTIME struct as a parameter will ...

  3. 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).

  4. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A leap year has one more day, so the year following a leap year begins on the second day of the week after the leap year began. Every four years, the starting weekday advances five days, so over a 28-year period, it advances 35, returning to the same place in both the leap year progression and the starting weekday.

  5. Module:Easter - Wikipedia

    en.wikipedia.org/wiki/Module:Easter

    INPUTS: Year - Any year between 326 and 4099. Method - 1 = the original calculation based on the Julian calendar 2 = the original calculation, with the Julian date converted to the equivalent Gregorian calendar 3 = the revised calculation based on the Gregorian calendar 4 = the revised calculation based on the Meletian calendar OUTPUTS: None.

  6. Bug compatibility - Wikipedia

    en.wikipedia.org/wiki/Bug_compatibility

    Microsoft Excel has always had a deliberate leap year bug, which falsely treats 29 February 1900 as an actual date, to ensure backward compatibility with Lotus 1-2-3. [ 20 ] Hyrum Wright , an engineer at Google , talks about this problem that he observed firsthand while working on C++ core libraries.

  7. 2024 is a leap year, but why? Here’s the science behind the ...

    www.aol.com/news/2024-leap-why-science-behind...

    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 ...

  8. 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 ...

  9. Template:IsLeapYear - Wikipedia

    en.wikipedia.org/wiki/Template:IsLeapYear

    {{IsLeapYear|year}} year defaults to {{CURRENTYEAR}} (2024). It must be specified in the Gregorian calendar, extended to all epochs using linear year numbering: use the proleptic Gregorian calendar in Christian Era before the change, and the astronomical year convention (using negative numbers, and year 0) in all years BC before the Christian era (there's a difference of 1 in absolute value).