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  2. Undecimber - Wikipedia

    en.wikipedia.org/wiki/Undecimber

    Undecimber or Undecember is a name for a thirteenth month in a calendar that normally has twelve months. Etymology ... added two months to the year 15 BC, ...

  3. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An extra day added as a holiday at the end of the year (after December 28, i.e. equal to December 31 Gregorian), sometimes called "Year Day", does not belong to any week and brings the total to 365 days.

  4. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    Leap week calendar with 4:5:4 weeks per month Hanke–Henry Permanent Calendar: solar: Gregorian: 2004 — Leap week calendar with 30:30:31 days per month, revised in 2011 and 2016 Igbo calendar: solar: Indigenous West African: 2009: Igbo people: Proposal [18] based in Igbo tradition dating back to 13th century, 13 lunar months of 28 days ...

  5. Ethiopian calendar - Wikipedia

    en.wikipedia.org/wiki/Ethiopian_Calendar

    The Ethiopian calendar has twelve months, all thirty days long, and five or six epagomenal days, which form a thirteenth month. [2] The Ethiopian months begin on the same days as those of the Coptic calendar, but their names are in Geʽez. A sixth epagomenal day is added every four years, without exception, on 29 August of the Julian calendar ...

  6. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The months of these calendars begin on the day with the new moon, with 12 or 13 months (lunations) in a year. The intercalary month is placed at the end of the year. In Qin China, the Qin calendar (simplified Chinese: 秦历; traditional Chinese: 秦曆) was introduced. It follows the rules of Zhuanxu's calendar, but the months order follows ...

  7. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The Lunar Hijri calendar is a lunar calendar consisting of 12 months in a year of 354 or 355 days. The astronomer's mean tropical year , which is averaged over equinoxes and solstices, is currently 365.24219 days, slightly shorter than the average length of the year in most calendars.

  8. List of date formats by country - Wikipedia

    en.wikipedia.org/wiki/List_of_date_formats_by...

    Basic components of a calendar date for the most common calendar systems: D – day; M – month; Y – year; Specific formats for the basic components: yy – two-digit year, e.g. 24; yyyy – four-digit year, e.g. 2024; m – one-digit month for months below 10, e.g. 3; mm – two-digit month, e.g. 03; mmm – three-letter abbreviation for ...

  9. Zulu calendar - Wikipedia

    en.wikipedia.org/wiki/Zulu_calendar

    The lunar seasonal calendar has 13 months [3] that do not correspond to the months of the Gregorian calendar. [4] Twelve of the lunar months (inyanga) of the Zulu calendar have around 28 days. [5] [6] Zulu names for the lunar months are based on observations of nature and seasonal activities. [7] A 13th intercalary month (iNdida) lasts four to ...

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