ok so:

i have a list of 100 product codes in row b2:cw2, colum A contains dates in the month, yesterdays first and then each previous day before that going down, and the columns B:CW are the number of each particular product sold on that day.

I'd like to insert a formula in row 1 which will look down each column and count the number of blank cells from B3 to the first cell to contain a value, i.e. the number of days since this particular product was sold.

any ideas?

thanks in advance.