International Fixed Calendar

The International Perpetual calendar (also known as the International Fixed calendar, the Cotsworth plan, the Eastman plan, the 13 Month calendar or the Equal Month calendar) is a proposal for calendar reform providing for a year of 13 months of 28 days each, with one day at the end of each year belonging to no month or week. The thirteenth month is inserted between June and July and called Sol or Midi. In leap years, a leap day, again belonging to no month or week is inserted between June and the new month. Regular years are 365 days long; leap years are 366 days long. The International Fixed Calendar League, with offices in London and in Rochester, New York, ceased activities in the 1930s. In recent years there have been attempts to revive the plan. The International Perpetual calendar is based on the Positivist Calendar published in 1849 by French philosopher Auguste Comte (1798-1857). Comte based his calendar on Polynesian calendars. The main difference between the International Perpetual calendar and the Positivist calendar is the names Comte gave to months and days. The months in the Positivist calendar were, in order: Moses, Homer, Aristotle, Archimedes, Caesar, St. Paul, Charlemagne, Dante, Gutenberg, Shakespeare, Descartes, Frederick II and Bichat. Every day of the year was likewise named. Positivist weeks begin with Monday instead of Sunday. The 13 months and extra days occur on the following Gregorian dates:
  January  Jan 1 - Jan 28     July      Jul 16 - Aug 12  February Jan 29 - Feb 25    August    Aug 13 - Sep 9  March    Feb 26 - Mar 25*   September Sep 10 - Oct 7  April    Mar 26* - Apr 22*  October   Oct 8 - Nov 4  May      Apr 23* - May 20*  November  Nov 5 - Dec 2   June     May 21* - Jun 17*  December  Dec 3 - Dec 30   Leap Day June 17            Extra day December 31  Sol/Midi Jun 18 - Jul 15 
  * These dates are a day earlier in a leap year 

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