I have got a date(as_of_date) field in a table (sales) containing sale dates from sept 2012 to June 2013. days we had no sale were not recorded and as such as_of_date field ONLY contains dates when a sale was made. I would like to get last 5 working days of each month (when sales was made) in a dropdown starting from June 2013 going back to Sept 2013.