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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. International Date Line - Wikipedia

    en.wikipedia.org/wiki/International_Date_Line

    The International Date Line (IDL) is the line extending between the South and North Poles that is the boundary between one calendar day and the next. It passes through the Pacific Ocean , roughly following the 180.0° line of longitude and deviating to pass around some territories and island groups.

  4. Decimal time - Wikipedia

    en.wikipedia.org/wiki/Decimal_time

    Excel serial dates: 36526.5; As many decimal places may be used as required for precision, so 0.5 d = 0.500000 d. Fractional days are often calculated in UTC or TT, although Julian Dates use pre-1925 astronomical date/time (each date began at noon = ".0") and Microsoft Excel uses the local time zone of the computer. Using fractional days ...

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  6. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    ISO 8601 is an international standard covering the worldwide exchange and communication of date and time-related data.It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1]

  7. Date and time representation by country - Wikipedia

    en.wikipedia.org/wiki/Date_and_time...

    This corresponds to the time between 7:00 and 8:00 being the eighth hour of the day (the first hour starting at midnight). Russian uses the same convention: четверть восьмого (quarter of the eighth hour), полвосьмого (half of eight), без четверти восемь (eight without a quarter) meaning 7:15, 7:30, 7: ...

  8. ‘Time is money’: Shopify calculator shows how much ... - AOL

    www.aol.com/time-money-shopify-calculator-shows...

    ‘Time is money’: Shopify calculator shows how much unnecessary meetings really cost the company. Jennifer Korn. July 12, 2023 at 3:48 PM ‘Time is money’: Shopify calculator shows how much ...

  9. Sunrise equation - Wikipedia

    en.wikipedia.org/wiki/Sunrise_equation

    A plot of hours of daylight as a function of the date for changing latitudes. This plot was created using the simple sunrise equation, approximating the sun as a single point and does not take into account effects caused by the atmosphere or the diameter of the Sun.