Editing International Fixed Calendar (section)

== Rules ==
The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An [[Intercalation (timekeeping)|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. Each year coincides with the corresponding [[Gregorian calendar|Gregorian]] year, so January 1 in the Cotsworth calendar always falls on Gregorian January 1.{{efn|See the table in {{harvnb | Cotsworth | 1905 | p=i}} }}  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 (from the point of view of its Northern Hemisphere authors) and including the mid-year ''[[solstice]]'', the name of the new month was chosen in homage to the sun.<ref>Cotsworth suggested "Mid" as an alternative name. See his address in Royal Society of Canada, ''Proceedings and Transactions of the Royal Society of Canada,'' 3d series, vol. II (Ottawa: James Hope & Son, 1908), pp. 211-41  at 231.</ref>

[[Leap year]]s in the International Fixed Calendar contain 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 years as June 29 - between Saturday June 28 and Sunday Sol 1.

Each month begins on a Sunday, and ends on a Saturday; consequently, every year begins on Sunday. Neither Year Day nor Leap Day are considered to be part of any week; they are preceded by a Saturday and are followed by a Sunday, making a [[long weekend]]. 
As a result, a particular day usually has a different day of the week in the IFC than in all traditional calendars that contain a seven-day week. The IFC is, however, almost compatible with the [[World Calendar]] in this regard, because it also starts Sunday and has the extra day at the end of the year and the leap day in the middle, except IFC leaps on Gregorian June 17 and TWC leaps two weeks later on July 1. Since this break of the ancient week cycle has been a major concern raised against its adoption, various [[leap week calendar]]s have been proposed as a solution.

{|class="wikitable"
|+ Common arrangement of all months
|-
!scope="col"  colspan="8"| Days of the week
|-
!scope="col" title="Sunday" | Sun
!scope="col"  title="Monday" | Mon
!scope="col"  title="Tuesday" | Tue
!scope="col"  title="Wednesday" | Wed
!scope="col"  title="Thursday" | Thu
!scope="col"  title="Friday" | Fri
!scope="col"  title="Saturday" | Sat
!scope="col" title="Holiday"| Hol
|-
| 01 || 02 || 03 || 04 || 05 || 06 || 07
|rowspan="3"| Leap Day,<br /> Year Day
|-
| 08 || 09 || 10 || 11 || 12 || 13 || 14
|-
| 15 || 16 || 17 || 18 || 19 || 20 || 21
|-
| 22 || 23 || 24 || 25 || 26 || 27 || 28 ||style="color:#AAA"| ''X''*
|}
<nowiki>*</nowiki> The two special dates have been recorded as either the 29th day of the month ending or the 0th day of the month beginning, or, more correctly, as outside any month and week with no ordinal number.

The date for {{TODAY}}, using this calendar is {{IntFixCal}}.

The following table shows how the 13 months and extra days of the International Fixed Calendar occur in relation to the dates of the Gregorian calendar:
{| class="wikitable"
|-
!scope="col" rowspan="2"| IFC
!scope="col" colspan="2"| Matching dates on the Gregorian calendar
|-
!scope="col"| Starts on fixed day 1
!scope="col"| Ends on fixed day 28
|-
!scope="row"| January
| January 1 || January 28
|-
!scope="row"| February
| January 29 || February 25
|-
!scope="row"| March
| February 26 || March 25*
|-
!scope="row"| April
| March 26* || April 22*
|-
!scope="row"| May
| April 23* || May 20*
|-
!scope="row"| June
| May 21* || June 17*
|- style="background-color:#EEE"
!scope="ro2| ''Leap Day''*
|colspan="2"| June 17
|-
!scope="row"| Sol
| June 18 || July 15
|-
!scope="row"| July
| July 16 || August 12
|-
!scope="row"| August
| August 13 || September 9
|-
!scope="row"| September
| September 10 || October 7
|-
!scope="row"| October
| October 8 || November 4
|-
!scope="row"| November
| November 5 || December 2
|-
!scope="row"| December
| December 3 || December 30
|- style="background-color:#EEE"
!scope="row"| ''Year Day''
|colspan="2"| December 31
|}
<nowiki>*</nowiki> In a leap year, these Gregorian dates between March and June are a day earlier. March in the Fixed Calendar always has a fixed number of days (28), and includes a potential Gregorian February 29. The rule for finding leap years is the same in both calendars.