JSON Serializer with custom Javascript converter (used to Datetime formatting)

JSONSerializer.aspx.cs

namespace dotnet_topics3
{
    public partial class JavascriptSerializerDemo : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            Person p1 = new Person() { Name = "Subhasis Rout", Age = 26, DOB = Convert.ToDateTime("1984/06/30") };
            Person p2 = new Person() { Name = "Jason Leung", Age = 30, DOB = null };

            List<Person> listPerson = new List<Person>() { p1, p2 };

            var ser = new JavaScriptSerializer();
            
            ser.RegisterConverters(new JavaScriptConverter[] {new DateTimeConverter()});
            //without the above line
            //{"DOB":"\/Date(457381800000)\/","Age":26,"Name":"Subhasis Rout"}
            //{"DOB":{"DateTime":"1984-06-30 00.00.00"},"Age":26,"Name":"Subhasis Rout"}  (FORMATTED)

            string str = ser.Serialize(listPerson);

        }
    }
    public class DateTimeConverter : JavaScriptConverter
    {
        public override IEnumerable<Type> SupportedTypes
        {
            get { return new List<Type>() { typeof(DateTime), typeof(DateTime?) }; }
        }

        public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
        {
            Dictionary<string, object> result = new Dictionary<string, object>();
            if (obj == null) return result;
            result["DateTime"] = ((DateTime)obj).ToString("yyyy-MM-dd HH.mm.ss");
            return result;
        }

        public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer)
        {
            if (dictionary.ContainsKey("DateTime"))
                return new DateTime(long.Parse(dictionary["DateTime"].ToString()), DateTimeKind.Unspecified);
            return null;
        }
    } 

}