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  2. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    One can readily see that, in a given year, the last day of February and March 1 are a good test dates. As an aside note, if we have a three-digit number abc, where a, b, and c are the digits, each nonpositive if abc is nonpositive; we have (abc) mod 7 = 9*a + 3*b + c. Repeat the formula down to a single digit.

  3. Determination of the day of the week - Wikipedia

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

    For determination of the day of the week (1 January 2000, Saturday) the day of the month: 1 ~ 31 (1) the month: (6) the year: (0) the century mod 4 for the Gregorian calendar and mod 7 for the Julian calendar (0). adding 1+6+0+0=7. Dividing by 7 leaves a remainder of 0, so the day of the week is Saturday. The formula is w = (d + m + y + c) mod 7.

  4. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    In the figure, the fraction 1/9000 is displayed in Excel. Although this number has a decimal representation that is an infinite string of ones, Excel displays only the leading 15 figures. In the second line, the number one is added to the fraction, and again Excel displays only 15 figures. In the third line, one is subtracted from the sum using ...

  5. Days in inventory - Wikipedia

    en.wikipedia.org/wiki/Days_in_inventory

    Inventory levels (measured at cost) are divided by sales per day (also measured at cost rather than selling price.) The formula for days in inventory is: D I I = a v e r a g e i n v e n t o r y C O G S / D a y s {\displaystyle DII={\dfrac {average~inventory}{COGS/Days}}} , alternatively expressed as: D I I = I n v e n t o r y A v e r a g e d a ...

  6. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    For March, one can remember either Pi Day or "March 0", the latter referring to the day before March 1, i.e. the last day of February. For the months April through December, the even numbered months are covered by the double dates 4/4, 6/6, 8/8, 10/10, and 12/12, all of which fall on the doomsday.

  7. Numeric precision in Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Numeric_precision_in...

    Excel maintains 15 figures in its numbers, but they are not always accurate; mathematically, the bottom line should be the same as the top line, in 'fp-math' the step '1 + 1/9000' leads to a rounding up as the first bit of the 14 bit tail '10111000110010' of the mantissa falling off the table when adding 1 is a '1', this up-rounding is not undone when subtracting the 1 again, since there is no ...

  8. Is there a formula for a perfect day? - AOL

    www.aol.com/lifestyle/formula-perfect-day...

    Time is of the essence. Really, there might be a best time of day to do just about everything. Shout-out to the Daily Mail for coming up with a list of their own. First up -- the best time to ...

  9. Julian day - Wikipedia

    en.wikipedia.org/wiki/Julian_day

    Lilian date: day 1 = October 15, 1582 [b] floor (JD − 2299159.5) 161551: Count of days of the Gregorian calendar: Rata Die: day 1 = January 1, 1 [b] proleptic Gregorian calendar: floor (JD − 1721424.5) 739286: Count of days of the Common Era: Mars Sol Date: 12:00 December 29, 1873 (JD − 2405522)/1.02749 53712.60055: Count of Martian days ...