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  2. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    The number of days between two dates, which is simply the difference in their Julian day numbers. The dates of moveable holidays, like Christian Easter (the calculation is known as Computus) followed up by Ascension Thursday and Pentecost or Advent Sundays, or the Jewish Passover, for a given year. Converting a date between different calendars.

  3. Julian day - Wikipedia

    en.wikipedia.org/wiki/Julian_day

    The Julian date (JD) of any instant is the Julian day number plus the fraction of a day since the preceding noon in Universal Time. Julian dates are expressed as a Julian day number with a decimal fraction added. [ 8] For example, the Julian Date for 00:30:00.0 UT January 1, 2013, is 2 456 293.520 833. [ 9]

  4. Day count convention - Wikipedia

    en.wikipedia.org/wiki/Day_count_convention

    Is the next coupon payment date, usually it is close to Date2. This would be the maturity date if there are no more interim payments to be made. Days(StartDate, EndDate) Function returning the number of days between StartDate and EndDate on a Julian basis (i.e., all days are counted). For instance, Days(15 October 2007, 15 November 2007 ...

  5. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The Gregorian year, which is in use in most of the world, begins on January 1 and ends on December 31. It has a length of 365 days in an ordinary year, with 8760 hours, 525,600 minutes, or 31,536,000 seconds; but 366 days in a leap year, with 8784 hours, 527,040 minutes, or 31,622,400 seconds. With 97 leap years every 400 years, the year has an ...

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

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

    Franklin D. Roosevelt. 4,422 days. (1933–1945) William Henry Harrison. 31 days. (1841) This is a list of presidents of the United States by time in office. The listed number of days is calculated as the difference between dates, which counts the number of calendar days except the last day. The length of a full four-year presidential term of ...

  7. Knuckle mnemonic - Wikipedia

    en.wikipedia.org/wiki/Knuckle_mnemonic

    One-handed. One form of the mnemonic is done by counting on the knuckles of one's hand to remember the number of days in each month. [ 1] Knuckles are counted as 31 days, depressions between knuckles as 30 (or 28/29) days. One starts with the little finger knuckle as January, and one finger or depression at a time is counted towards the index ...

  8. Leap year - Wikipedia

    en.wikipedia.org/wiki/Leap_year

    Leap year. A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year. [ 1]

  9. 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 August 2024" is ten days after "15 August 2024". The date of a particular event depends on the observed time zone.