clone years

New term: "Clone years"

Two years are clone years if they have dates that fall on the same days of the week. For example, 1984 was a leap year that started on a sunday. The next leap year that started on a sunday was 2012, and the one after that will be 2040. So 1984, 2012, and 2040 are all clone years.

1985 was a non-leap year that started on a tuesday. The next non-leap year that started on a tuesday was 1991, so 1985 and 1991 are clone years.