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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. Determination of the day of the week - Wikipedia

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

    Day-item: The total, thus reached, must be corrected, by deducting "1" (first adding 7, if the total be "0"), if the date be January or February in a leap year, remembering that every year, divisible by 4, is a Leap Year, excepting only the century-years, in 'New Style', when the number of centuries is not so divisible (e.g. 1800).

  4. Time formatting and storage bugs - Wikipedia

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

    One workaround is to use the year 1996, 2024 or 2052 in lieu of 2080 (as compatible leap years) to display the correct day of the week, date and month on the main screen. [ citation needed ] Systems storing the year as a two-digit value 00..99 internally only, like many RTCs, may roll over from 31 December 2079, to the IBM PC and DOS epoch of ...

  5. 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.

  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

    Whether you’ve realized it or not, 2024 is a leap year. ... in an even number, 354, the king rounded his year up to 355. ... 24 hours — or one day. “You add a day every four years and that ...

  7. Legality in terms of drinking and voting is not impacted by leap years, even if someone is "technically" not 18 or 21. If you're born on February 29, your birthday would be observed after 11:59 p ...

  8. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    Find the week number of Saturday 5th November 2016 (leap year): Find the ordinal day number first: moy = 11 dom = 5 leap = 1 add = 305, from table lookup doy = 305 + 5 = 310. Alternatively, use spreadsheet serial day numbers instead: off = 42369, i.e. 31st December 2015 day = 42679 doy = 42679 − 42369 = 310. Finally, find the week number:

  9. 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 ...