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  2. 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.

  3. Wikipedia:Reference desk/Archives/Language/2015 September 7

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

    "Within" goes in both directions: 90 days plus and 90 days minus the central date in question. Let's say that today is September 7, 2015 (which it is). The time period within 90 days of today (September 7, 2015) is a 180-day time period.

  4. Military designation of days and hours - Wikipedia

    en.wikipedia.org/wiki/Military_designation_of...

    Times relative to the designation are indicated with +/−[Arabic numeral] after the letter, replacing -day or -hour with a count of the same unit: "D−1" (the day before D-Day), "L+9" (9 hours after L-Hour) etc. [citation needed] In less formal contexts, the symbol or numeral may be spelled out: "D minus 1" or "L plus nine." [citation needed ...

  5. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    The anchor day for the century was 94 days after Tuesday, or, in other words, Friday (calculated as 18 × 5 + ⌊ ⁠ 18 / 4 ⁠ ⌋; or just look at the chart, above, which lists the century's anchor days). The digits 61 gave a displacement of six days so doomsday was Thursday. Therefore, April 4 was Thursday so April 12, eight days later, was ...

  6. Day count convention - Wikipedia

    en.wikipedia.org/wiki/Day_count_convention

    This convention accounts for days in the period based on the portion in a leap year and the portion in a non-leap year. The days in the numerators are calculated on a Julian day difference basis. In this convention the first day of the period is included and the last day is excluded. The CouponFactor uses the same formula, replacing Date2 by Date3.

  7. Order of operations - Wikipedia

    en.wikipedia.org/wiki/Order_of_operations

    When the user is unsure how a calculator will interpret an expression, parentheses can be used to remove the ambiguity. [ 3 ] Order of operations arose due to the adaptation of infix notation in standard mathematical notation , which can be notationally ambiguous without such conventions, as opposed to postfix notation or prefix notation ...

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    www.aol.com/products/utilities/ad-free-mail

    Ad-Free AOL Mail offers you the AOL webmail experience minus paid ads, allowing you to focus on your inbox without distractions, for just $4.99 per month. Get Ad-Free AOL Mail Get a more ...

  9. Countdown - Wikipedia

    en.wikipedia.org/wiki/Countdown

    The T-minus clock, a schedule of planned activities prior to launch (T−0), and The L-minus clock, a mechanical countdown to the time of launch (L−0). Except for the last few minutes, which are highly automated and rigid, scheduled activities rarely take exactly the scheduled time, and the T-minus clock only corresponds approximately to the ...