SUM Data In Columns By Month And Year For Multiple Worksheets?

I have been trying to sum the data in each column on each tab of my workbook by month and year into one pivot table on a new summary worksheet within the workbook. In the summary pivot table, I would like to be able to select the description as labeled on the tab and a year or month and have the respective totals for each tab and set of columns displayed. The column headings may or may not be the same for each tab. I've been able to separate the data for each tab and summarize without dates or sum the data in columns by date via a pivot table, but I have not been able to consolidate the data for both tabs, with the option to select the month and year, in one pivot table.