First, consider abandoning all parameter prompt queries since they have a
very poor user interface and are not very functional. You should use
references to values of controls on forms. For instance:
Between Forms!frmDates!txtStart and Forms!frmDates!txtEnd
If you use this in a crosstab, you must set the query parameter datatypes.
Select Query->Parameters and enter
Forms!frmDates!txtStart Date/time
Forms!frmDates!txtEnd Date/Time
-- Duane Hookom
MS Access MVP