Need Date in Days Expression

I have an expression in a ssrs report that is a date can some one tell me how to formati the date to show days

example my expression =FormatDate Time(Fields!BillDate.Value,2)

This shows 02/02/2007 as the date

What i need it to say 33 days how can I format my exprsion in my ssrs report to reflect this..

HI,cpowers:

What is the meaning of 'What i need it to say 33 days how can I format my exprsion in my ssrs report to reflect this..'

Would you please clarify more about your requirement?

Thanks in advance!

sql