Parameter field for date is not working

I created crystal report and i created one parameter field for column date_of_birth field.it is date

data type in sql server.it is stored as yyyy-mm-dd. 2015-09-26.

 

After creating the parameter the records are filtering and showing according to dates in preview of crystal report.it is showing all records.

 

So please tell what is steps for creating date parameter in crystal report.