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| International Fixed Calendar | |
|---|---|
| Name | International Fixed Calendar |
| Alt | 13-month calendar |
| Introduced | 1902 (proposal); 1923–1930 (promotion) |
| Creator | Moses B. Cotsworth, popularized by George Eastman |
| Type | Reform calendar |
| Months | 13 |
| Days per month | 28 |
| Extra days | Year Day, Leap Day |
International Fixed Calendar is a proposed perennial calendar reform that divides the year into 13 months of 28 days each, plus one or two intercalary days to align with the solar year. It was formulated in the early 20th century and promoted through industrial advocacy, legislative efforts, and organizational trials. Proponents argued the model would simplify accounting, scheduling, and religious observance, while opponents raised cultural, legal, and practical objections.
The scheme traces to Moses B. Cotsworth, a British company director and calendar reformer who presented a 13-month model to Royal Society-era audiences and commercial boards in the late 19th and early 20th centuries. Interest increased when George Eastman, founder of Eastman Kodak Company, endorsed the plan during the 1920s and 1930s, funding promotional literature and trials at Eastman Kodak facilities in Rochester, New York. The proposal intersected with activities of International Committee on Calendar Reform, World Calendar Association, and reform advocates linked to League of Nations-era discussions. Legislative attention reached national bodies such as the United States Congress and the British Parliament, and reform discussions surfaced in media outlets like the New York Times and periodicals associated with Scientific American and Nature.
The calendar arranges 13 equal months—commonly named by Cotsworth's scheme with an added month often called "Sol" or "Undecember"—each containing exactly four weeks of seven days, yielding 28 days per month. This regularity means each date falls on the same weekday every year, a property attractive to accounting departments at corporations such as Eastman Kodak Company, General Electric, and Ford Motor Company that sought predictable payroll and fiscal cycles. To reconcile with the tropical year, one extra "Year Day" is inserted as a holiday outside the weekly cycle; leap years add a second "Leap Day." The design contrasts with structures used by Gregorian calendar, Julian calendar, and other historical systems like the Roman calendar and the French Republican Calendar.
Advocacy organizations—International Fixed Calendar League, World Calendar Association, and allies within Chamber of Commerce networks—lobbied businesses and legislators. George Eastman pushed implementation internally at Eastman Kodak and promoted adoption through philanthropic connections to institutions such as Smithsonian Institution and University of Rochester. The plan reached formal consideration in bodies including the United States Congress and municipal councils in Rochester, New York; similar proposals were debated in United Kingdom committees and by economists linked to League of Nations staff. Trials appeared in corporate scheduling and academic experiments at places like Harvard University, Massachusetts Institute of Technology, and industrial firms in Germany and France. Despite endorsements from figures in business, astronomy and mathematics communities, national adoption failed owing to legislative inertia and opposition from religious institutions including representatives of Roman Catholic Church, Eastern Orthodox Church, and various Protestant denominations.
Supporters argued benefits for multinational corporations such as General Motors and Standard Oil by easing quarterly accounting and forecasting. Predictable calendars promised streamlined payroll for employers like AT&T and U.S. Steel and simplified statistical reporting for agencies like U.S. Census Bureau and central banks (e.g., Federal Reserve System). Critics highlighted disruptions to religious observance calendars recognized by Vatican City leaders and Ecumenical Patriarchate authorities, and legal complications affecting statutory dates managed by institutions such as Supreme Court of the United States and national courts. Economists from London School of Economics and historians at British Museum questioned cultural inertia; labor unions including American Federation of Labor and Congress of Industrial Organizations raised concerns about work schedules. Technical objections referenced astronomical considerations from astronomers at Royal Observatory, Greenwich and mathematicians at École Normale Supérieure.
Promotional campaigns influenced corporate culture at firms like Eastman Kodak Company and touched philanthropic agendas connected to Rockefeller Foundation and Ford Foundation initiatives. Cultural resistance involved religious calendars observed by communities tied to Hebrew calendar, Islamic calendar, and Christian liturgical calendar institutions, with festivals such as Passover, Ramadan, and Easter complicating alignment. Economists studying productivity at University of Chicago and Columbia University modeled potential shifts in fiscal periods for firms listed on exchanges like New York Stock Exchange and London Stock Exchange. Labor historians connected reform debates to union negotiations in industries centered in Detroit, Manchester, and Leipzig.
Compared to the Gregorian calendar, the International Fixed Calendar offered perennial regularity but required insertion of intercalary days similar to the Hebrew calendar's leap-month system and the Islamic calendar's lunar adjustments. It paralleled ambitions of the French Republican Calendar and echoed structural elements of the Positivist calendar advocated by Auguste Comte. Astronomers referenced models from Metonic cycle analyses and contrasted the proposal with reform suggestions by figures such as Pope Gregory XIII and Julius Caesar's Julian reform. Legal scholars compared jurisdictional impacts against precedents in calendar shifts like the Gregorian calendar adoption events in Great Britain and Russia.
Though never adopted as a national standard, the calendar influenced corporate scheduling practices and remains a subject of academic study in institutions like Smithsonian Institution, Library of Congress, and university archives at Yale University and University of Rochester. Contemporary enthusiasts maintain societies and digital tools hosted by organizations with links to calendar reform scholarship and museums such as National Museum of American History. The proposal is cited in discussions of business process optimization at consultancies like McKinsey & Company and in speculative fiction by authors published by Penguin Books and HarperCollins. Its legacy persists in pedagogy, museum exhibits, and archival materials across libraries including British Library and New York Public Library.
Category:Calendar reform