Description : When can a calendar be reused?
Last Answer : From 1901 to 2071, the rules are as follows: A leap year will repeat itself after 28 years. The first year after a leap year will repeat itself in a 6-11-11 pattern. This means it will repeat after ... 6 pattern. This means it will repeat after 11 years, then after 22 years, and then after 28 years.