I have an equation in cell AR279
=IFERROR(INDEX(AG274:AN274,MATCH($AD$8,$AG$270:$AN$270,0)),"")
However i need to change this so that it picks up the number from the previous quarter (i.e the date that is three months earlier)
So If AD = 25 MAR 14, I would like it to pick up the number from AJ 274
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