If you want thtem to select both a Start and End date create one parameter field as Start Date (or whatever) as either a DATE or DATETIME field type (depends on what you are going to compare it against).
Repeat with an End Date (or whatever name you want) parameter.
Go into your select expert and add the selection of
{table.datefield} in {?Start Date} to {?End Date}
The {?parameterfieldname} items will be available in the drop downs if the datatypes match.
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