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2. 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 § Julian day number calculation within that article for details ...

3. Zazzle - Wikipedia

   en.wikipedia.org/wiki/Zazzle

   Zazzle. Zazzle is an American online marketplace that allows designers and customers to create their own products with independent manufacturers (clothing, posters, etc.), as well as use images from participating companies. Zazzle has partnered with many brands to amass a collection of digital images from companies like Disney, Warner Brothers ...

4. Doomsday rule - Wikipedia

   en.wikipedia.org/wiki/Doomsday_rule

   The Doomsday rule, Doomsday algorithm or Doomsday method is an algorithm of determination of the day of the week for a given date. It provides a perpetual calendar because the Gregorian calendar moves in cycles of 400 years. The algorithm for mental calculation was devised by John Conway in 1973, [1] [2] drawing inspiration from Lewis Carroll ...

5. List of date formats by country - Wikipedia

   en.wikipedia.org/wiki/List_of_date_formats_by...

   All examples use example date 2021-03-31 / 2021 March 31 / 31 March 2021 / March 31, 2021 – except where a single-digit day is illustrated. Basic components of a calendar date for the most common calendar systems: D – day; M – month; Y – year; Specific formats for the basic components: yy – two-digit year, e.g. 24; yyyy – four-digit ...

6. Old Style and New Style dates - Wikipedia

   en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

   The issue spans the changeover; the date heading reads: "From Tuesday September 1, O.S. to Saturday September 16, N.S. 1752". [1] Old Style ( O.S.) and New Style ( N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in ...

7. When Are Taxes Due for 2021? Tax Year Dates You Need To Know

   www.aol.com/finance/tax-deadline-dates-know...

   Important 2021 Tax Due Dates for Individuals. Jan. 15, 2021. If you are required to make estimated tax payments, your payment for the fourth quarter of tax year 2020 is due on this date.