public class DatePartsConverter : JavaScriptConverter

{

  public override IEnumerable<Type> SupportedTypes

  {

    get { yield return typeof(DateTime); }

  }

  public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)

  {

    if (obj is DateTime)

    {

      DateTime date = (DateTime)obj;

      var json = new Dictionary<string, object>();

      json["year"] = date.Year;

      json["month"] = date.Month;

      json["day"] = date.Day;

      return json;

    }

    return null;

  }

  public override object Deserialize(IDictionary<string, object> json, Type type, JavaScriptSerializer serializer)

  {

    if (type == typeof(DateTime))

    {

      object year, month, day;

      json.TryGetValue("year", out year);

      json.TryGetValue("month", out month);

      json.TryGetvalue("day", out day);

      if ((year is int)

       && (month is int)

       && (day is int))

        return new DateTime((int)year, (int)month, (int)day);

    }

    return null;

  }

}