Hi,
For this purpose you could use simply SearchDialogWithResults web part + two SmartSearchFilter web parts (dateFrom, dateTo). In this specific case you should set Filter mode property to textbox. Then open the properties of the SearchDialogWithResults web part, and set Search condition property to: +DocumentCreatedWhen:[{%dateFrom|(tosearchdatetime)%} TO {%dateTo|(tosearchdatetime)%}]. That should do the trick.
Best Regards,
Roman Konicek