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  2. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    The number of days between two dates, which is simply the difference in their Julian day numbers. The dates of moveable holidays, like Christian Easter (the calculation is known as Computus) followed up by Ascension Thursday and Pentecost or Advent Sundays, or the Jewish Passover, for a given year. Converting a date between different calendars.

  3. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    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 various European countries between 1582 and 1923. In England, Wales, Ireland and Britain's American colonies, there were two calendar ...

  4. Hebrew calendar - Wikipedia

    en.wikipedia.org/wiki/Hebrew_calendar

    e. The Hebrew calendar (Hebrew: הַלּוּחַ הָעִבְרִי, romanized: halLūaḥ hāʿĪḇrī), also called the Jewish calendar, is a lunisolar calendar used today for Jewish religious observance and as an official calendar of Israel. It determines the dates of Jewish holidays and other rituals, such as yahrzeits and the schedule of ...

  5. Wikipedia:Manual of Style/Dates and numbers - Wikipedia

    en.wikipedia.org/.../Dates_and_numbers

    A date can be given in any appropriate calendar, as long as it is (at the minimum) given in the Julian calendar or the Gregorian calendar or both, as described below. For example, an article on the early history of Islam may give dates in both Islamic and Julian calendars. Where a calendar other than the Julian or Gregorian is used, the article ...

  6. Dating creation - Wikipedia

    en.wikipedia.org/wiki/Dating_creation

    Two dominant dates for creation using such models exist, about 5500 BC and about 4000 BC. These were calculated from the genealogies in two versions of the Bible, with most of the difference arising from two versions of Genesis. The older dates stem from the Greek Septuagint. [55] The later dates are based on the Hebrew Masoretic Text. [56]

  7. 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 's ...

  8. Egyptian calendar - Wikipedia

    en.wikipedia.org/wiki/Egyptian_calendar

    The ancient Egyptian calendar – a civil calendar – was a solar calendar with a 365-day year. The year consisted of three seasons of 120 days each, plus an intercalary month of five epagomenal days treated as outside of the year proper. Each season was divided into four months of 30 days. These twelve months were initially numbered within ...

  9. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Perpetual Calendar Gregorian Calendar adoption dates for many countries. World records for mentally calculating the day of the week in the Gregorian Calendar ; The Calendar FAQ – Frequently Asked Questions about Calendars; Today's date (Gregorian) in over 800 more-or-less obscure foreign languages Archived 8 March 2023 at the Wayback Machine