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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. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    Bold figures (e.g., 04) denote leap year. If a year ends in 00 and its hundreds are in bold it is a leap year. Thus 19 indicates that 1900 is not a Gregorian leap year, (but 19 in the Julian column indicates that it is a Julian leap year, as are all Julian x00 years). 20 indicates that 2000 is a leap year. Use Jan and Feb only in leap years.

  4. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    Bold figures (e.g., 04) denote leap year. If a year ends in 00 and its hundreds are in bold, it is a leap year. Thus 19 indicates that 1900 is not a Gregorian leap year, (but bold 19 in the Julian column indicates that it is a Julian leap year, as are all Julian x00 years). 20 indicates that 2000 is a leap year. Use bold Jan and Feb only in ...

  5. Leap year - Wikipedia

    en.wikipedia.org/wiki/Leap_year

    A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year . [ 1 ]

  6. 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 ...

  7. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    For January, January 3 is a doomsday during common years and January 4 a doomsday during leap years, which can be remembered as "the 3rd during 3 years in 4, and the 4th in the 4th year". For March, one can remember either Pi Day or " March 0 ", the latter referring to the day before March 1, i.e. the last day of February.

  8. Why We Have Leap Years - AOL

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

    Credit - Lon Tweeten for TIME. I t would seem awfully hard to lose track of 0.24219 of a day. That not-inconsiderable amount adds up to five hours, 48 minutes and 20 seconds and if it were added ...

  9. Lunar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunar_calendar

    The best known of these is the Tabular Islamic calendar: in brief, it has a 30-year cycle with 11 leap years of 355 days and 19 years of 354 days. In the long term, it is accurate to one day in about 2,500 solar years or 2,570 lunar years. It also deviates from observation by up to about one or two days in the short term.