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  2. 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.

  3. Undecimber - Wikipedia

    en.wikipedia.org/wiki/Undecimber

    In the Java Platform, Standard Edition, the java.util.Calendar class includes support for calendars which permit thirteen months. [8] Although the Gregorian calendar used in most parts of the world includes only twelve months, there exist some lunar calendars that are divided into synodic months, with an intercalary or "leap" month added in some years.

  4. Pax Calendar - Wikipedia

    en.wikipedia.org/wiki/Pax_Calendar

    The common year is divided into 13 months of 28 days each, whose names are the same as in the Gregorian calendar, except that a month called Columbus occurs between November and December. The first day of every week, month and year would be Sunday.

  5. 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 ...

  6. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    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. The Gregorian calendar year, which is in use as civil calendar in most of the world, begins on January 1 and ends on December 31. [1]

  7. Positivist calendar - Wikipedia

    en.wikipedia.org/wiki/Positivist_calendar

    Every year has exactly 52 weeks divided in 13 months. Each month has exactly 28 days divided in 4 weeks. Every day of the month falls on the same weekday in each month (i.e. the 17th always falls on a Wednesday). The calendar is the same every year (perennial), unlike the annual Gregorian calendar, which differs from year to year.

  8. Igbo calendar - Wikipedia

    en.wikipedia.org/wiki/Igbo_calendar

    The Igbo calendar (Igbo: Ọ̀gụ́àfọ̀ Ị̀gbò [citation needed]) is the traditional calendar system of the Igbo people from present-day Nigeria.The calendar has 13 months in a year (Afọ), 7 weeks in a month (Ọnwa), and 4 days of Igbo market days (Eke, Orie, Afọ, na Nkwọ) in a week (Izu) plus an extra day at the end of the year, in the last month.

  9. Chinese calendar - Wikipedia

    en.wikipedia.org/wiki/Chinese_calendar

    A 12-month-year using this system has 354 days, which would drift significantly from the tropical year. To fix this, traditional Chinese years have a 13-month year approximately once every three years. The 13-month version has the same long and short months alternating, but adds a 30-day leap month (閏月; rùnyuè). Years with 12 months are ...