I see the problem. As only one filter is allowed on the dates, we can either remove the < and > extremes or eliminate a month, but not both. The solution is to create separate fields first in the source data for month and year. This simplifies the filtering and provides more flexibility on custom date selection in the resulting pivot report and chart.
To do this, create a new column Month and a new column Year. Use the formulas =MONTH(date) and =YEAR(date) on the date field and then include these two columns in the pivot report.
