Previous month data using current month input selection

Hi,

I am looks for suggestion in fulfilling a report requirement. Our users want to see selected month and previous month data in 1 report table

Data is at a daily level and users doesn't want to give 4 date selections (2 for getting current month data query and 2 for previous month data query) to get the desired output

Is there a way to get current and previous month data by just current month start date and end date

Our Environment: BO 4.0 SP06, WebI report, Oracle 11g

Thanks,

Mitch