Hello.
I have a function that allows me to calculate the length of time between two
dates.

=YEAR(B1)-YEAR(A1)-IF(OR(MONTH(B1)<MONTH(A1),AND(MONTH(B1)=MONTH(A1),
DAY(B1)<DAY(A1))),1,0)&" years, "&MONTH(B1)-MONTH(A1)+IF(AND(MONTH(B1)
<=MONTH(A1),DAY(B1)<DAY(A1)),11,IF(AND(MONTH(B1)<MONTH(A1),DAY(B1)
>=DAY(A1)),12,IF(AND(MONTH(B1)>MONTH(A1),DAY(B1)<DAY(A1)),-1)))&" months, "&B1-DATE(YEAR(B1),MONTH(B1)-IF(DAY(B1)<DAY(A1),1,0),DAY(A1))&" days"

I have a list of dates in adjacent columns. I want to be able to display the
result of this function in a third column, for the two dates in each row.
Can anyone tell me whether or not it is possible to somehow do this more
easily than pasting the function into each cell of the 3rd column and
changing the cell references in the funtion manually?
This is not practical as the columns are too large!
I only have a limited knowledge of Excel so I apologise if this is a simple
query.
Hope you clever people can help!
Many thanks