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

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)

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