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2. Estimated date of delivery - Wikipedia

   en.wikipedia.org/wiki/Estimated_date_of_delivery

   The estimated date of delivery ( EDD ), also known as expected date of confinement, [1] and estimated due date or simply due date, is a term describing the estimated delivery date for a pregnant woman. [2] Normal pregnancies last between 38 and 42 weeks. [3] Children are delivered on their expected due date about 4% of the time.

3. Calendrical calculation - Wikipedia

   en.wikipedia.org/wiki/Calendrical_calculation

   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 ...

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. Tax Deadline and Tax Due Dates for Your 2023 Taxes - AOL

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

   Jan. 16, 2024. If you pay your taxes quarterly this was the due date for your estimated tax payments for the 4th quarter. This includes income you earned from Sept. 1 through Dec. 31, 2023. Jan ...

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

   www.aol.com/finance/taxes-due-2021-tax-dates...

   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. Submit ...

7. Equation of time - Wikipedia

   en.wikipedia.org/wiki/Equation_of_time

   The equation of time is obtained from a published table, or a graph. For dates in the past such tables are produced from historical measurements, or by calculation; for future dates, of course, tables can only be calculated. In devices such as computer-controlled heliostats the computer is often programmed to calculate the equation of time.