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  2. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The International Fixed Calendar (also known as the Cotsworth plan, the Cotsworth calendar, the Eastman plan or the Yearal) [1] was a proposed reform of the Gregorian calendar designed by Moses B. Cotsworth, first presented in 1902. [2] The International Fixed Calendar divides the year into 13 months of 28 days each.

  3. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    Some calendars listed are identical to the Gregorian calendar except for substituting regional month names or using a different calendar epoch. For example, the Thai solar calendar (introduced 1888) is the Gregorian calendar using a different epoch (543 BC) and different names for the Gregorian months (Thai names based on the signs of the zodiac).

  4. List of adoption dates of the Gregorian calendar by country

    en.wikipedia.org/wiki/List_of_adoption_dates_of...

    There are only four countries which have not adopted the Gregorian calendar for civil use: Ethiopia (Ethiopian calendar), Nepal (Vikram Samvat and Nepal Sambat), Iran (Solar Hijri calendar) [1] and Afghanistan (Lunar Hijri Calendar). [2] Thailand has adopted the Gregorian calendar for days and months, but uses its own era for years: the ...

  5. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    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. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  6. Calendar reform - Wikipedia

    en.wikipedia.org/wiki/Calendar_reform

    Lunisolar calendars usually have 12 or 13 months of 29 or 30 days. The Hermetic Lunar Week Calendar is a lunisolar calendar proposal which has 12 or 13 lunar months of 29 or 30 days a year, and begins each year near the vernal equinox. [9]

  7. 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 ...

  8. 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.

  9. 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.

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