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  2. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    That day corresponded to February 29 in the Julian calendar and to March 11 in the Gregorian calendar. [5] [6] The Swedish conversion to the Gregorian calendar was finally accomplished in 1753, when February 17 was followed by March 1. [5] Artificial calendars may also have 30 days in February. For example, in a climate model the statistics may ...

  3. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details).

  4. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 January 2025" is ten days after "15 January 2025". The date of a particular event depends on the observed time zone.

  5. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    The tables below list equivalent dates in the Julian and Gregorian calendars. ... Gregorian date Difference −500: March 5: February 28: −500: March 6: March 1 ...

  6. Wikipedia : Unusual articles/Mathematics and numbers

    en.wikipedia.org/.../Mathematics_and_numbers

    11/11 makes an appropriate date to celebrate being single. Square Root Day: Any date when the day and month are both the square root of the last two digits of the year (the next being 5th May 2025). Star Wars Day: May the 4th be with you. Steak and Blowjob Day Cake and Cunnilingus Day: Male alternative to Valentine's Day and female response to ...

  7. A Full Calendar of All March Holidays and Observances

    www.aol.com/lifestyle/full-calendar-march...

    March 13. National Good Samaritan Day. National K9 Veterans Day. National Napping Day. March 14. International Day of Mathematics. National Potato Chip Day. Pi Day. White Day. March 15. World ...

  8. Everything You Need to Know About Why Easter's Date ... - AOL

    www.aol.com/everything-know-why-easters-date...

    And go ahead and prepare for an early Easter 2024: Next year, the date falls on March 31. Of course, this also means that the beginning of Lent and Ash Wednesday change dates too.

  9. Leap year starting on Thursday - Wikipedia

    en.wikipedia.org/wiki/Leap_year_starting_on_Thursday

    Like all leap year types, the one starting with 1 January on a Thursday occurs exactly once in a 28-year cycle in the Julian calendar, i.e. in 3.57% of years. As the Julian calendar repeats after 28 years that means it will also repeat after 700 years, i.e. 25 cycles. The year's position in the cycle is given by the formula (((year + 8) mod 28 ...