Mastrofini / Cotsworth-Eastman(KODAK) Calendar


**** Any Calendar Reform which proposes any extra days outside of a 7 day weekly cycle will result in a work day falling on the 7th Day Sabbath. ****
There have been two such proposals, 1 = Mastrofini - (28 day 13 month, xtra day/year, 2 xtra days/Leap Year) and 2 = Hanke/Henry (30-30-31 day 12 month, Leap Week every 5 or 6 years),
with other people reprising or offering slight variations (1 = Comte reprise, Cotsworth/EastmanKODAK reprise, 2 = World Calendar 31-30-30 xtra day/year, 2 xtra day Leap Year variation).


1834 AD - Abbe Marco Mastrofini, an Italian Roman Catholic priest, philosopher and mathematician devised a Calendar based on a 364 day year with 13 months of 28 days which included one or two "blank" days outside the weekly cycle of specific months to align the calendar with the solar orbit of seasons, one day each non-leap year and two days each Leap Year.

 

1849 AD - Auguste Comte reprised this 13 month Calendar. which was based on a 364-day year which included the one or two "blank" days that Abbe Marco Mastrofini, had devised 15 years before. Each of the 13 months had 28 days and exactly four weeks. Each quarter has three months and one week, or three and one-quarter months, causing fractional months. This fact alone would cause inconvenience to all activities and businesses based on quarter-years. Also, there would have been FOUR "Friday the 13ths" EVERY YEAR.

 

1927 AD - Reform of The Calendar - A propsal for the Mastrofini/Comte Calendar is reprised in 1927-12-24

 

1931 AD - Cotsworth-Eastman(Kodak) reprises the Mastrofini/Comte Calendar at the League of Nations. (YouTube Video)
At a meeting of the League of Nations (later replace by the United Nations) Moses D. Cotsworth and George Eastman (Kodak) attempted Calendar reform again
based on 13 months of 28 days (naming the additional month in the middle of the year as "Sol")
364 days per year with 13 months of 28 days, 7 day week, Sun to Sat. 1 blank day at end of every year, with 2 blank days every Leap year, one in the middle and one at the end.

1927 Time Magazine Business: Calendar |The Death and Life of the 13-Month Calendar |13 Months: The Kodak Calendar Experiment |The Discovery Blog - No Leap of Faith

 

Common Era (CE) and Before Common Era (BCE) - https://timeanddate.com/calendar/ce-bce-what-do-they-mean.html



2028 - Gregorian Calendar Fourteen (begins on Saturday)
 
January (31 days) February (29 Leap Year days) March (31 days)
SMTWTFSSMTWTFSSMTWTFS
      1  12345   1234
23456786789101112567891011
91011121314151314151617181912131415161718
161718192021222021222324252619202122232425
23242526272829272829    262728293031 
3031                   
April (30 days) May (31 days) June (30 days)
SMTWTFSSMTWTFSSMTWTFS
      1 123456    123
23456787891011121345678910
91011121314151415161718192011121314151617
161718192021222122232425262718192021222324
2324252627282928293031   252627282930 
30                    
July (31 days) August (31 days) September (30 days)
SMTWTFSSMTWTFSSMTWTFS
      1  12345     12
234567867891011123456789
91011121314151314151617181910111213141516
161718192021222021222324252617181920212223
232425262728292728293031  24252627282930
3031                   
October (31 days) November (30 days) December (31 days)
SMTWTFSSMTWTFSSMTWTFS
1234567   1234     12
8910111213145678910113456789
151617181920211213141516171810111213141516
222324252627281920212223242517181920212223
293031    2627282930  24252627282930
              31      


Any Gregorian year ending on Sunday (e.g. 2028, 2034, 2045, 2060) could be used to transition the next year to a new Calendar system starting on Monday.(e.g. 2029, 2035, 2046, 2061)

ISO 8601 - International Standard ISO 8601 defines the start of the week as Monday.
Any Calendar Reform which proposes any extra days outside of a 7 day weekly cycle will result in a wandering 7th Day Sabbath.

2029 - Mastrofini 28-13 - Non Leap Year (13 month - 28 Day, yearly extra days)(Cotsworth-leap week not extra days)
 
2029 - January (28 days) February (28 days) March (28 days) 
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSun
123456712345671234567
891011121314891011121314891011121314
151617181920211516171819202115161718192021
222324252627282223242526272822232425262728
April (28 days) May (28 days) June (28 Non-Leap days) 
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSun
123456712345671234567
891011121314891011121314891011121314
151617181920211516171819202115161718192021
222324252627282223242526272822232425262728
  Sol (28 days)   
       MonTueWedThuFriSatSun       
       1234567       
       891011121314       
       15161718192021       
       22232425262728       
July (28 days) August (28 days) September (28 days) 
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSun
123456712345671234567
891011121314891011121314891011121314
151617181920211516171819202115161718192021
222324252627282223242526272822232425262728
October (28 days) November (28 days) December (28 + 1 days)
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSunxtra
123456712345671234567 
891011121314891011121314891011121314
151617181920211516171819202115161718192021
22232425262728222324252627282223242526272829


2030 - Mastrofini 28-13 - Non Leap Year (13 month - 28 Day, yearly extra days)(Cotsworth-leap week not extra days)
 
2030 - January (28 days) February (28 days) March (28 days) 
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSun
123456712345671234567
891011121314891011121314891011121314
151617181920211516171819202115161718192021
222324252627282223242526272822232425262728
April (28 days) May (28 days) June (28 Non-Leap days) 
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSun
123456712345671234567
891011121314891011121314891011121314
151617181920211516171819202115161718192021
222324252627282223242526272822232425262728
  Sol (28 days)   
       MonTueWedThuFriSatSun       
       1234567       
       891011121314       
       15161718192021       
       22232425262728       
July (28 days) August (28 days) September (28 days) 
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSun
123456712345671234567
891011121314891011121314891011121314
151617181920211516171819202115161718192021
222324252627282223242526272822232425262728
October (28 days) November (28 days) December (28 + 1 days)
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSunxtra
123456712345671234567 
891011121314891011121314891011121314
151617181920211516171819202115161718192021
22232425262728222324252627282223242526272829


2031 - Mastrofini 28-13 - Non Leap Year (13 month - 28 Day, yearly extra days)(Cotsworth-leap week not extra days)
 
2031 - January (28 days) February (28 days) March (28 days) 
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSun
123456712345671234567
891011121314891011121314891011121314
151617181920211516171819202115161718192021
222324252627282223242526272822232425262728
April (28 days) May (28 days) June (28 Non-Leap days) 
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSun
123456712345671234567
891011121314891011121314891011121314
151617181920211516171819202115161718192021
222324252627282223242526272822232425262728
  Sol (28 days)   
       MonTueWedThuFriSatSun       
       1234567       
       891011121314       
       15161718192021       
       22232425262728       
July (28 days) August (28 days) September (28 days) 
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSun
123456712345671234567
891011121314891011121314891011121314
151617181920211516171819202115161718192021
222324252627282223242526272822232425262728
October (28 days) November (28 days) December (28 + 1 day)
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSunxtra
123456712345671234567 
891011121314891011121314891011121314
151617181920211516171819202115161718192021
22232425262728222324252627282223242526272829


2032 - Mastrofini 28-13 - Leap Year (13 month - 28 Day, yearly extra days)(Cotsworth/Kodak-leap week not extra days)
 
2032 - January (28 days) February (28 days) March (28 days) 
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSun
123456712345671234567
891011121314891011121314891011121314
151617181920211516171819202115161718192021
222324252627282223242526272822232425262728
April (28 days) May (28 days) June (28 +1 Leap Year day)
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSunxtra
123456712345671234567 
891011121314891011121314891011121314
151617181920211516171819202115161718192021
22232425262728222324252627282223242526272829
  Sol (28 days)   
       MonTueWedThuFriSatSun       
       1234567       
       891011121314       
       15161718192021       
       22232425262728       
July (28 days) August (28 days) September (28 days) 
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSun
123456712345671234567
891011121314891011121314891011121314
151617181920211516171819202115161718192021
222324252627282223242526272822232425262728
October (28 days) November (28 days) December (28 + 1 day)
MonTueWedThuFriSatSunMonTueWedThuFriSatSunMonTueWedThuFriSatSunxtra
123456712345671234567 
891011121314891011121314891011121314
151617181920211516171819202115161718192021
22232425262728222324252627282223242526272829

other Calendar Research references:
 

How Accurate Are Calendars? - https://www.timeanddate.com/date/perfect-calendar.html
The Roman Calendar - https://www.timeanddate.com/calendar/roman-calendar.html
The Julian Calendar - https://www.timeanddate.com/calendar/julian-calendar.html
The Gregorian Calendar - https://www.timeanddate.com/calendar/gregorian-calendar.html
The Persian Solar Hijri Calendar - https://www.timeanddate.com/calendar/persian-calendar.html
 
International Standard ISO 8601 is an international standard for the formatting of dates and times.
It has been adopted by most of the major countries around the world, either directly or as equivalent national standards.
There are a number of options in the standard but the basic idea is that a date is normally represented in the Year-Month-Day format YYYY-MM-DD
with the Year being four digits and the Month and Day both two digits. Similarly, a time is shown as Hour:Minute: Second with each being a two-digit number 24:59:59
Leading zeros are inserted as required to make each part of a date or time up to the specified number of digits. e.g. 2024-07-16 24:59:59
 
UTC: The World's Time Standard (Coordinated Universal Time) - Time Zone (Coordinated Universal Time) UTC-1 November Military