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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

   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 ...

4. 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 ...

5. 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.

6. Day count convention - Wikipedia

   en.wikipedia.org/wiki/Day_count_convention

   In finance, a day count convention determines how interest accrues over time for a variety of investments, including bonds, notes, loans, mortgages, medium-term notes, swaps, and forward rate agreements (FRAs). This determines the number of days between two coupon payments, thus calculating the amount transferred on payment dates and also the ...

7. Radiocarbon dating - Wikipedia

   en.wikipedia.org/wiki/Radiocarbon_dating

   date-range is the range of dates corresponding to the given confidence level; confidence indicates the confidence level for the given date range. For example, "cal 1220–1281 AD (1σ)" means a calibrated date for which the true date lies between AD 1220 and AD 1281, with a confidence level of '1 sigma', or approximately 68%. Calibrated dates ...