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  2. Estimated date of delivery - Wikipedia

    en.wikipedia.org/wiki/Estimated_date_of_delivery

    Here's the formula to calculate your Estimated Due Date using Naegele's rule : Date of Last Menstrual Period + 7 Days + 9 Calendar Months = Date of Estimated Date of Delivery. Example: LMP = 8 May 2020. +1 year = 8 May 2021. −3 months = 8 February 2021.

  3. Ordinal date - Wikipedia

    en.wikipedia.org/wiki/Ordinal_date

    An ordinal date is a calendar date typically consisting of a year and an ordinal number, ranging between 1 and 366 (starting on January 1), representing the multiples of a day, called day of the year or ordinal day number (also known as ordinal day or day number ). The two parts of the date can be formatted as "YYYY-DDD" to comply with the ISO ...

  4. Julian day - Wikipedia

    en.wikipedia.org/wiki/Julian_day

    The Julian date (JD) of any instant is the Julian day number plus the fraction of a day since the preceding noon in Universal Time. Julian dates are expressed as a Julian day number with a decimal fraction added. [8] For example, the Julian Date for 00:30:00.0 UT January 1, 2013, is 2 456 293.520 833. [9]

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

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

    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. 29, 2024

  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. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the number from the "Difference" column.

  8. Stardate - Wikipedia

    en.wikipedia.org/wiki/Stardate

    Stardate. A stardate is a fictional system of time measurement developed for the television and film series Star Trek. In the series, use of this date system is commonly heard at the beginning of a voice-over log entry, such as "Captain's log, stardate 41153.7. Our destination is planet Deneb IV …".

  9. 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 ...

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