datetime parameter

hello, 

public IEnumerable<database_WICs> GetDate(DateTime? start, DateTime? end)
        {
            var data = from c in db.database_WICs
                       where c.UploadDate == start &&
                       c.UploadDate== end
                       select c;
            return data.ToList();
        }

the code produces empty array using the following query string API - http://localhost:45361/api/data?start=25/11/2013&end=28/11/2013

any help would be very much appreciated. 

Thank you