Reports are always by default last WP, but that can be changed in Report Explorer.
Since you obviously have this Report on a Custom Screen to be able to feed a Command Value in as a parameter, you can also change the Date Range using using Refresh Custom Report Widget using the Date Filter parameter.
You can also feed in the Command Value (or anything really) using the Report Parameters parameter, which accepts comma-separated values, and puts those values into $1, $2, $3, etc in your Report.