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CAL13  FIXED  CALENDAR
  perennial calendar

13 months of 28 days each
Ita, Eng, Fra, Esp
     
  
  
 
Sunday  
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday  
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday  
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday  
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
 
days

M01

M02

M03

M04

M05

M06

M07

M08

M09

M10

M11

M12

M13
 D1  1 1 1 1 1 1 1 1 1 1 1 1 1
D2 2 2 2 2 2 2 2 2 2 2 2 2 2
D3 3 3 3 3 3 3 3 3 3 3 3 3 3
D4 4 4 4 4 4 4 4 4 4 4 4 4 4
D5 5 5 5 5 5 5 5 5 5 5 5 5 5
D6 6 6 6 6 6 6 6 6 6 6 6 6 6
D7 7 7 7 1/4 7 7 7 7 7 7 7 7 7
D1 8 8 8 8 8 8 8 8 8 8 8 8 8
D2 9 9 9 9 9 9 9 9 9 9 9 9 9
D3 10 10 10 10 10 10 10 10 10 10 10 10 10
D4 11 11 11 11 11 11 11 11 11 11 11 11 11
D5 12 12 12 12 12 12 12 12 12 12 12 12 12
D6 13 13 13 13 13 13 13 13 13 13 13 13 13
D7 14 14 14 14 14 14 1/2 14 14 14 14 14 14
D1 15 15 15 15 15 15 15 15 15 15 15 15 15
D2 16 16 16 16 16 16 16 16 16 16 16 16 16
D3 17 17 17 17 17 17 17 17 17 17 17 17 17
D4 18 18 18 18 18 18 18 18 18 18 18 18 18
D5 19 19 19 19 19 19 19 19 19 19 19 19 19
D6 20 20 20 20 20 20 20 20 20 20 20 20 20
D7 21 21 21 21 21 21 21 21 21 3/4 21 21 21
D1 22 22 22 22 22 22 22 22 22 22 22 22 22
D2 23 23 23 23 23 23 23 23 23 23 23 23 23
D3 24 24 24 24 24 24 24 24 24 24 24 24 24
D4 25 25 25 25 25 25 25 25 25 25 25 25 25
D5 26 26 26 26 26 26 26 26 26 26 26 26 26
D6 27 27 27 27 27 27 27 27 27 27 27 27 27
D7 28 28 28 28 28 28 28 28 28 28 28 28 28
E1 extra day 1  29
E2 in leap year : extra day 2  30
 
      
 
All the years, months, weeks and quarters begin with D1. A quarter = 13 weeks.
The extra days (holiday) do not belong to the weeks : after the extra days begins the first week of the new year.
 
Common year = 13 months of 28 days + 1 extra day = 52 weeks + 1 extra day = 364 days + 1 extra day = 365 days.
Leap year = 13 months of 28 days + 2 extra days = 52 weeks + 2 extra days = 364 days + 2 extra days = 366 days.
 
      
 
CAL13 calendar :
 
CAL13 (pdf),   CAL13 with quarters (pdf)
  
CAL13 < > Gregorian calendar :
 
CAL13 < > Gregorian ( 2015...2040, + 2045 + 2051 + 2062 )
CAL13 < > Gregorian : common years
CAL13 < > Gregorian : leap years
  >  PDF ;  example : 2017 (pdf)
  >  PDF ;  example : 2016 (pdf)
CAL13 < > Gregorian, with quarters (pdf)
 
CAL13 < > Gregorian with M01-01 = winter solstice ( December 21 ) :
 
CAL13 < > Gregorian  ( 2016...2026, + 2032 + 2037 + 2043 + 2054 )
CAL13 < > Gregorian : common years
CAL13 < > Gregorian : leap years
  >  PDF
  >  PDF
CAL13 < > Gregorian with quarters and seasons (2026 )
 
 
 
       
       
 
Date formats :
 
     yyyy-Mmm-dd , or  Mmm-dd :
 
          yyyy = year: -9999...9999,    mm = month: 01...13,   dd = day: 01...28 ;

               examples :  2017-M05-21  ,  M05-21,
               examples :  2015-M01-01  ,  M01-01, 
 
          extra days :
               example E1 :  2018-M13-29 ,
               example E2 :  2016-M13-30 ,
 
          comparison Gregorian ( ISO ) < > CAL13 :
 
               example :   2018-09-15  ( 15 Sept 2018 )   <=>   2018-M10-06  ( CAL13 )
               example :   2020-02-29  ( 29 Feb  2020 )   <=>   2020-M03-04  ( CAL13 )
 
Week dates :
 
     yyyy-Www-d , or  yyyy-Www :
 
          yyyy = year: -9999... 9999,    ww = week: 01...52,    d = day: 1...7
 

               example :   2026-W45-1  =  2026-M11-01 ,
               example :   2020-W09     =  2020-M03-01..07
Ordinal dates :
 
     yyyy-ddd :
 
          yyyy = year: -9999... 9999,    ddd = day: 001...366 ;
 
               example :   2017-365  =  2017-M13-29 ,
               example :   2018-091  =  2018-M04-07   ( last day of the first quarter )
 
 
  
 
       
 
A calendar similar to CAL13 was proposed by Moses B. Cotsworth in 1902,   
see International fixed calendar, and the opinion of George Eastman Kodak President
 
     
     
 
CAL13 calendar
Leap year
ISO 8601, ( mathematics of the ISO 8601 calendar )
  
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2000 - 2009(K13) - 2015(CAL13)