International Fixed Calendar - Rules

Rules

The calendar year has 13 months with 28 days each, divided into exactly 4 weeks . An extra day added as a holiday at the end of the year, sometimes called "Year Day," brings the total to 365 days. Each year coincides with the corresponding Gregorian year, so January 1 in the Cotsworth calendar always falls on Gregorian January 1. Twelve months are named and ordered the same as those of the Gregorian calendar, except that the extra month is inserted between June and July, and called Sol. Situated in mid-summer, the name of the new month was chosen in homage to the sun. But it escaped notice that the sun's prominence around June and July holds for the Northern hemisphere only.

Leap year in the International Fixed Calendar contains 366 days, and its occurrence follows the Gregorian rule. There is a leap year in every year whose number is divisible by 4, but not if the year number is divisible by 100, unless it is also divisible by 400. So although the year 2000 was a leap year, the years 1700, 1800, and 1900 were common years. The International Fixed Calendar inserts the extra day in leap year after June 28th and before Sol 1st.

Each month begins on a Sunday, and ends on a Saturday; consequently, every year begins on Sunday. All the months look like this:

Sun Mon Tue Wed Thu Fri Sat
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28

The 13 months and extra days occur on the following Gregorian dates:

Month Starts Ends
January January 1 January 28
February January 29 February 25
March February 26 March 25*
April March 26* April 22*
May April 23* May 20*
June May 21* June 17*
Leap Day June 17
Sol June 18 July 15
July July 16 August 12
August August 13 September 9
September September 10 October 7
October October 8 November 4
November November 5 December 2
December December 3 December 30
Year Day December 31

*These dates are a day earlier in a leap year.

Read more about this topic:  International Fixed Calendar

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