Days of the Week in Reports

I am looking for a way to track the days of the week a customer usually purchases. I have a report not a search that shows month by month sales total and the number of transactions but I also want to see what days of the week they usually order. I have a lot of customers that order every week or every other week. Additionally I have customers that order only on Wednesday or on Monday and Wednesday etc. I am using the report instead of a search because the results show in Monthly columns which easier to read than