Hello need the help of the guru's again. I'm using CR 10 Professional, and VB.NET

I have a program that stores appointments for customers. I have a CR that shows the appointments by each day. I am looking for a way where only last month's appointments show up on my CR.

Ex:

My report has the appointments grouped into each day, and shows everyday that has an appointment
ex: Monday 10/11/05 then Tuesday 10/12/05

I don't want those to show up when the month ends, how do I do this? Thanks!!