You can refer to a date range from the underlying query if you're using a parameter query. In the report, create 2 unbound text boxes. Set the data sources equal to the parameter query's prompt. For example:
Query1 is filtered by pickup_dt
I place pickup_dt in the query 2 times. The first criteria is >=[Enter Start Date]and the second is <=[Enter End Date]
On the report: txt_stDate has a control source of =[Enter Start Date] and txt_endDate has a control source of =[Enter End Date]
I run the report & enter the prompted dates, they appear on the report as I entered them. (Although using a form is probably a better method, this will work) I hope this helped.