Find a column and return values

Sorry
Gettin confused, I have uploaded an example

F1=01/11/2008
AI=30/11/2008

I know that the first day of the month will always be in F1
So A1=F1
C2=DATE(YEAR(A1),MONTH(A1)+1,0)

C2 is now 30/11/2008
I need to search from F1 to AI to find the column that 30/11/2008 is in
I then need to get all the values from that column and place them in A23 to A42
So i need to get the values from AI2 to AI21 and copy them to A23 to A42

The column position of the last day of the month changes every .month

or in a23
=HLOOKUP($C$2,$F$1:$AJ$21,ROW()-21,FALSE) dragged down

Thanks Folks
Thats great