It is possible to find repeating year calendars. Calendars repeat in a certain pattern. They repeat in 5, 6, 11 or 28 years interval. The most accurate one is the 28 year pattern. For example, 28 years before 2018 was 1990. January 1 1990 was a Monday, January 1 2018 is also a Monday. The calendars of these two years are the same.