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  2. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    February 30 or 30 February is a date that does not occur on the Gregorian calendar, where the month of February contains only 28 days, or 29 days in a leap year. However, from a historical perspective February 30 has been used at least once and appears in some reform calendars .

  3. List of presidents of the United States by time in office

    en.wikipedia.org/wiki/List_of_presidents_of_the...

    The length of a full four-year term of office for a president of the United States usually amounts to 1,461 days (three common years of 365 days plus one leap year of 366 days). The listed number of days is calculated as the difference between dates , which counts the number of calendar days except the first day ( day zero ).

  4. Wikipedia:Manual of Style/Dates and numbers - Wikipedia

    en.wikipedia.org/.../Dates_and_numbers

    Roman numerals are not normally used for dates. Two thousand one: 2001: Years and days of the month are not normally written in words. the first of May May the first: 1 May or May 1: June 0622: June 622: Do not zero-pad years. June 2,015: June 2015: Do not add a comma to a four-digit year. sold in the year 1995: sold in 1995

  5. Great Disappointment - Wikipedia

    en.wikipedia.org/wiki/Great_Disappointment

    Sears tied Daniel's prophecies in with the Book of Revelation in the New Testament in support of BaháΚΌí teaching, interpreting the year 1260 as the "times, time and half a time" of Daniel 7:25 (3 and 1/2 years = 42 months = 1,260 days).

  6. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    The Julian reform did not change the method used to account days of the month in the pre-Julian calendar, based on the Kalends, Nones and Ides, nor did it change the positions of these three dates within the months. Macrobius states that the extra days were added immediately before the last day of each month to avoid disturbing the position of ...

  7. 360-day calendar - Wikipedia

    en.wikipedia.org/wiki/360-day_calendar

    The 360-day calendar is a method of measuring durations used in financial markets, in computer models, in ancient literature, and in prophetic literary genres.. It is based on merging the three major calendar systems into one complex clock [citation needed], with the 360-day year derived from the average year of the lunar and the solar: (365.2425 (solar) + 354.3829 (lunar))/2 = 719.6254/2 ...

  8. Calendar reform - Wikipedia

    en.wikipedia.org/wiki/Calendar_reform

    The Meyer–Palmen Solilunar Calendar has 12 lunar months with 29 or 30 days plus a leap month called Meton every 3 or 2 years with 30 or 31 days. 60 years together are called a cycle. It uses a leap cycle which has equal number of days, weeks, months, years and cycles. 2498258 days, 356894 weeks, 84599 months, 6840 years and 114 cycles nearly ...

  9. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    The original Roman calendar is usually believed to have been an observational lunar calendar [2] whose months ended and began from the new moon. [3] [4] Because a lunar cycle is about 29.5 days long, such months would have varied between 29 and 30 days. [5]