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  2. Wikipedia:Age calculation templates - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Age_calculation...

    Some of these templates can be complex, and will greatly add to the loading time of a page if used many times. For example, in an article like list of Prime Ministers of Canada by time in office, the template is only used for the incumbent prime minister, and fixed numbers are used for all past prime ministers.

  3. Template:Age in years and days - Wikipedia

    en.wikipedia.org/wiki/Template:Age_in_years_and_days

    Returns the number of full years and surplus days between two specified dates (or, if only one date is entered, between the specified date and today's date) Template parameters [Edit template data] This template prefers inline formatting of parameters. Parameter Description Type Status Earlier date 1 The earlier date being compared Date required Later date 2 The later date being compared ...

  4. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    Excel supports dates with years in the range 1900–9999, except that December 31, 1899, can be entered as 0 and is displayed as 0-jan-1900. Converting a fraction of a day into hours, minutes and days by treating it as a moment on the day January 1, 1900, does not work for a negative fraction.

  5. Julian day - Wikipedia

    en.wikipedia.org/wiki/Julian_day

    A formula for determining the year of the Julian Period given its character involving three four-digit numbers was published by Jacques de Billy in 1665 in the Philosophical Transactions of the Royal Society (its first year). [33] John F. W. Herschel gave the same formula using slightly different wording in his 1849 Outlines of Astronomy. [34]

  6. 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.

  7. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    The basic approach of nearly all of the methods to calculate the day of the week begins by starting from an "anchor date": a known pair (such as 1 January 1800 as a Wednesday), determining the number of days between the known day and the day that you are trying to determine, and using arithmetic modulo 7 to find a new numerical day of the week.

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  9. Present value - Wikipedia

    en.wikipedia.org/wiki/Present_value

    If offered a choice between $100 today or $100 in one year, and there is a positive real interest rate throughout the year, a rational person will choose $100 today. This is described by economists as time preference. Time preference can be measured by auctioning off a risk free security—like a US Treasury bill.