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  2. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    A calendar date is a reference to a particular day represented within a calendar system. 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.

  3. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar is proleptic before 1582 (calculated backwards on the same basis, for years before 1582), and the difference between Gregorian and Julian calendar dates increases by three days every four centuries (all date ranges are inclusive).

  4. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    A calendar can also mean a list of planned events, such as a court calendar, or a partly or fully chronological list of documents, such as a calendar of wills. Periods in a calendar (such as years and months) are usually, though not necessarily, synchronized with the cycle of the sun or the moon.

  5. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    Calendar year. Generally speaking, a calendar year begins on the New Year's Day of the given calendar system and ends on the day before the following New Year's Day, and thus consists of a whole number of days.

  6. Hebrew calendar - Wikipedia

    en.wikipedia.org/wiki/Hebrew_calendar

    The Hebrew week ( שבוע, shavua) is a cycle of seven days, mirroring the seven-day period of the Book of Genesis in which the world is created. The names for the days of the week are simply the day number within the week. The week begins with Day 1 ( Sunday) and ends with Shabbat ( Saturday ).

  7. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    Calendars are explicit schemes used for timekeeping. The first historically attested and formulized calendars date to the Bronze Age, dependent on the development of writing in the ancient Near East. In 2000 AD, Victoria, Australia, a Wurdi Youang stone arrangement could date back more than 11,000 years. [1]

  8. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    List of calendars. In the list below, specific calendars are given, listed by calendar type ( solar, lunisolar or lunar ), time of introduction (if known), and the context of use and cultural or historical grouping (if applicable). Where appropriate, the regional or historical group ( Jewish calendar, Hijri calendar, Sikh, Mayan, Aztecan ...

  9. 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.

  10. Anno Mundi - Wikipedia

    en.wikipedia.org/wiki/Anno_Mundi

    Because this is just before midnight when the Western day begins, but after 6 pm when the Jewish calendrical day begins (equivalent to the next tabular day with the same daylight period), its Julian calendar date is 67 October 3761 BCE (Gregorian: 6–7 September 3761 BCE or −3760).

  11. Federal holidays in the United States - Wikipedia

    en.wikipedia.org/wiki/Federal_holidays_in_the...

    Federal holidays in the United States are 11 calendar dates designated by the U.S. federal government as holidays. On these days non-essential U.S. federal government offices are closed and federal employees are paid for the day off.