Query/Filtering by Date

I have a table in my database that has a date field (we'll call salesdate). I use this table in a query, which is in turn linked to an excel spreadsheet and turned in a pivot table.

Here is my question. The salesdate field is formatted as XX/XX/XXXX. The pivot table shows the entire tables data. I would like to be able to filter in the pivot table by month instead of having to click 30 days each month. So the end user could go the filter or control, and filter by August 2010 for example.

I read Excel 2010 has a new type of filter where you could filter by a date range but I am using 2007. I also played with changing the database itself or the query in Access. Could I have an Expr field that modifies the salesdate field? This would in turn create a better field to use a filter by having a list (August 2010, September 2010, or ...Sept-10, Aug-10 etc.

Any advice on the most practical solution is appreciated.

You need to take a look at the group by functions of a pivot table, you can group by month and year