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  2. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    Thus in a common year the week number on the doomsday itself is one less if it is a Sunday, i.e. in a common year starting on Friday (such as 2010, 2021, & 2027). Computer formula for the anchor day of a year. For computer use, the following formulas for the anchor day of a year are convenient. For the Gregorian calendar:

  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 ยง Julian day number calculation within that article for details ...

  4. Day count convention - Wikipedia

    en.wikipedia.org/wiki/Day_count_convention

    The conventions of this class calculate the number of days between two dates (e.g., between Date1 and Date2) as the Julian day difference. This is the function Days(StartDate, EndDate). The conventions are distinguished primarily by the amount of the CouponRate they assign to each day of the accrual period. Actual/Actual ICMA. Formulas:

  5. Ordinal date - Wikipedia

    en.wikipedia.org/wiki/Ordinal_date

    An ordinal date is a calendar date typically consisting of a year and an ordinal number, ranging between 1 and 366 (starting on January 1), representing the multiples of a day, called day of the year or ordinal day number (also known as ordinal day or day number ). The two parts of the date can be formatted as "YYYY-DDD" to comply with the ISO ...

  6. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    24 Tir 1403. 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 July 2024" is ten days after "15 July 2024". The date of a particular event depends on the observed time zone.

  7. 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 2456293.520833. [9]

  8. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    Dominical letters or Sunday letters are a method used to determine the day of the week for particular dates. When using this method, each year is assigned a letter (or pair of letters for leap years) depending on which day of the week the year starts. The Dominical letter for the current year 2024 is GF . Dominical letters are derived from the ...

  9. Amortization schedule - Wikipedia

    en.wikipedia.org/wiki/Amortization_schedule

    An amortization schedule is a table detailing each periodic payment on an amortizing loan (typically a mortgage ), as generated by an amortization calculator. [1] Amortization refers to the process of paying off a debt (often from a loan or mortgage) over time through regular payments. [2] A portion of each payment is for interest while the ...