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  2. Leap year problem - Wikipedia

    en.wikipedia.org/wiki/Leap_year_problem

    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.

  3. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    One can readily see that, in a given year, the last day of February and March 1 are a good test dates. As an aside note, if we have a three-digit number abc, where a, b, and c are the digits, each nonpositive if abc is nonpositive; we have (abc) mod 7 = 9*a + 3*b + c. Repeat the formula down to a single digit.

  4. Time formatting and storage bugs - Wikipedia

    en.wikipedia.org/wiki/Time_formatting_and...

    On 5 January 1975, the 12-bit field that had been used for dates in the TOPS-10 operating system for DEC PDP-10 computers overflowed, in a bug known as "DATE75". The field value was calculated by taking the number of years since 1964, multiplying by 12, adding the number of months since January, multiplying by 31, and adding the number of days since the start of the month; putting 2 12 − 1 ...

  5. Caesar created a new Julian calendar for Rome that measured a year as 365.25 days long, as the original Roman year was 10 days shorter than a modern year. The seasons were thrown off as a result ...

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

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

    Check your calendars, California. We get an extra day this month. Whether you’ve realized it or not, 2024 is a leap year.Every four years (typically), a leap year occurs in February — making ...

  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. Proleptic Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Proleptic_Julian_calendar

    Thus, the year 1 BC of the proleptic Julian calendar is a leap year. This is to be distinguished from the astronomical year numbering , introduced in 1740 by French astronomer Jacques Cassini , which considers each New Year an integer on a time axis , with year 0 corresponding to 1 BC, and "year −1" corresponding to 2 BC, so that in this ...

  9. Huh? How Often Do We Have Leap Years, Exactly? - AOL

    www.aol.com/huh-often-leap-years-exactly...

    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.