Displays previous week data

Hello Experts,

I have one small requirement. I need your suggestions how to do. Please suggest me how to do. Kindly share me your valuable suggestions.

Based on the prompt selection of user it need to displays the previous week data, current month data, current quarter data, current year data.

For ex: If i select today's date(24/08/2015), It need to displays the previous week(34 th week of this year) data, Current month(August) data from

1/8/2015 to 24/8/2015), Current quarter(August) data from July to 24/8/2015, Current year(2015) data from jan 2015 to 24/8/2015.

I need to do all calculations in the webi report. Suggest me how to do.

Thanks

Sravani.N