Cotsworth

Cotsworth refers to the calendar reform movement associated with Moses B. Cotsworth, an early 20th‑century advocate for a new way of organizing time. The reform is most commonly called the Cotsworth calendar, and it is also known as the International Fixed Calendar or the World Calendar in different sources. The aim of the proposal was to simplify date calculations, regularize months, and stabilize the annual structure for business, education, and planning.

The core idea of the Cotsworth calendar is to divide the year into 13 months of 28 days each, for a total of 364 days. Each month would thus contain exactly four weeks, and the calendar layout would be highly regular, with dates aligning to the same weekdays across years. To complete the year, one additional day, known as Year Day, would be placed outside the weekly cycle. In leap years, a second extra day, Leap Day, would also be added outside the weeks. These extra days were intended to avoid disturbing the seven-day weekly rhythm.

History and reception: The proposal gained some attention in calendar and reform circles during the early to mid‑20th century, with advocates forming organizations to promote adoption. However, it never achieved widespread governmental or commercial adoption, and the Gregorian calendar remains the de facto standard in most countries. The Cotsworth calendar is now primarily of historical and comparative interest as an example of calendar reform efforts and the ongoing search for timekeeping consistency.