Scheduling WebI report for a specific date

Hi Friends,

Hope all are doing well..!

I am back again with a new question

I have a WebI report were I have scheduled it to run as weekly (Monday) but the challenge is this report schedule has to pick the last Saturday for its every weekly schedule.

E.g: I am scheduling for 06/22/2015 (Monday) I have a prompt as "Week Ending" the report has to pick the Week ending date as 06/20/2015

for next Weekly (Monday) Schedule 06/29/2015 the Week Ending should be 06/27/2015.... it goes on like this for every week.....

Currently I am doing this manually every Friday I go and change the date on Week Ending prompt to Saturday's date and wait for the Schedule to run on Monday. Can someone help me in solving this issue or how we can achieve this Scheduling..?

Many thanks,

Feroze