Stacked Data Charts from Excel

I have two columns of data - the first is a set of dates, i.e., 2/4/08,
3/4/08; the second column contains 4 different values depicting incidents
that occurred on the corresponding dates. I want to display a horizontal axis
of months from June 08 through March 2010, and a vertical axis of numbers of
incidents. The objective is to show how many incidents if each type occurred
each month, stacked up for a total quantity of incidents per month.