You can have your query ask you to input the parameters yourself everytime you run the query, otherwise known as a parameter query in which the user interactively specifies one or more criteria values as the query runs. It further extends the flexibility of your query.
1. Open query in design view
2. Enter the following data in the Criteria row underneath your start date field:
Code:
>=[Enter the start date for this range] And <=[Enter the end date for this range]
3. Save
4. Run Query
Hope this helps,