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  2. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    These formulas are based on the observation that the day of the week progresses in a predictable manner based upon each subpart of that date. Each term within the formula is used to calculate the offset needed to obtain the correct day of the week. For the Gregorian calendar, the various parts of this formula can therefore be understood as follows:

  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. 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.

  5. 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 ...

  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. Is 2024 a leap year? When is leap day, and why is it needed?

    www.aol.com/2024-leap-leap-day-why-204215160.html

    As mentioned, leap years typically take place every four years. That means the next leap years coming up after 2024 are 2028, 2032, 2036, 2040, 2044 and 2048. But again, it's not quite that easy.

  8. 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.

  9. 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 ...