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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. Conversion between Julian and Gregorian calendars - Wikipedia

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

    Conversion between Julian and Gregorian calendars. The tables below list equivalent dates in the Julian and Gregorian calendars. Years are given in astronomical year numbering . This is a visual example of the official date change from the Julian calendar to the Gregorian.

  4. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A perpetual calendar employs a table for finding which of fourteen yearly calendars to use. A table for the Gregorian calendar expresses its 400-year grand cycle: 303 common years and 97 leap years total to 146,097 days, or exactly 20,871 weeks.

  5. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    Description. The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years.

  6. Julian day - Wikipedia

    en.wikipedia.org/wiki/Julian_day

    Converting Julian calendar date to Julian Day Number. Finding Julian date given Julian day number and time of day. Finding day of week given Julian day number. Julian or Gregorian calendar from Julian day number. Julian Period from indiction, Metonic and solar cycles. Julian date calculation.

  7. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 May 2024" is ten days after "15 May 2024". The date of a particular event depends on the observed time zone.

  8. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    Julian. 11 May 2024. The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts of Oriental Orthodoxy as well as by the Amazigh people (also known as the Berbers).

  9. Holocene calendar - Wikipedia

    en.wikipedia.org/wiki/Holocene_calendar

    The Holocene calendar, also known as the Holocene Era or Human Era ( HE ), is a year numbering system that adds exactly 10,000 years to the currently dominant ( AD/BC or CE/BCE) numbering scheme, placing its first year near the beginning of the Holocene geological epoch and the Neolithic Revolution, when humans shifted from a hunter-gatherer ...

  10. Calendrical Calculations - Wikipedia

    en.wikipedia.org/wiki/Calendrical_Calculations

    Calendrical Calculations is a book on calendar systems and algorithms for computers to convert between them. It was written by computer scientists Nachum Dershowitz and Edward Reingold and published in 1997 by the Cambridge University Press.

  11. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The International Fixed Calendar (also known as the IFC, Cotsworth plan, the Cotsworth calendar and the Eastman plan) is a proposed calendar reform designed by Moses B. Cotsworth, first presented in 1902. [1] The International Fixed Calendar divides the year into 13 months of 28 days each.