In Encore Viewer, double click on whatever month is displayed where September appears in my post.
You'll get a drop down list of the months of the year - select one.
Now double click on whatever year is displayed where 2011 appears in my post - select whatever year you want.
Now switch to the right box and do the same.
Here is an illustration using my old data and Encore Viewer 2.0
Pick the day of the month you want in each box and click on Show Report.
If you are only looking for the last week, then only click on the left box items. My guess 5 clicks at most.