How many months apart are November 24 1989 and March 8 1991?
March 1991 is the 16th month after November 1989, but there is
not a full 16 months between the days.
March 8, 1991 was 469 days after November 24, 1989, or 15 months
and 12 days.
(Nov 24 to February 24, and 12 days more)