International Fixed

13 months of 28 days · Kodak ran on it until 1989

Moses Cotsworth’s 1902 reform: thirteen months of exactly twenty-eight days, with a new month, Sol, slipped between June and July, plus a Year Day belonging to no month or week at all. Every date falls on the same weekday all year. Eastman Kodak ran its entire business on it from 1928 until 1989.

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