International Fixed Calendar
About the International Fixed Calendar
Moses Cotsworth proposed a perpetual calendar of 13 months of exactly 28 days, with a new month, Sol, between June and July and an extra Year Day outside any week. Every month would start on a Sunday and every date would fall on the same weekday each year. It was never adopted by any country, but the Eastman Kodak company used it for internal accounting until 1989.
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