In reply to Saor Alba: Not sure what you asking.
Yes, you just change the format, or type in as 10/12/2014 or such like.. you can then send the values to other cells or add to that value elsewhere so click on H1 and do = F1+1 would be 11/12/2014
So you'd need to change the values to dates in the columns at the start, and then the values in the rows at the top to corresponding dates..