"LastModifiedDate": "/Date(1301412877000-0400)/"

public static double JsonTime(DateTime dt)
    {//Convert datetime to a Json Datetime
        DateTime d1 = new DateTime(1970, 1, 1);
        DateTime d2 = dt.ToUniversalTime();
        TimeSpan ts = new TimeSpan(d2.Ticks - d1.Ticks);
        return Math.Round( ts.TotalMilliseconds,0);
    }

if (data.indexOf("/Date(")==7)
       return  new Date(+data.replace(/D/g, ''));

string Padding = "000";
                for (int f = 1; f <= 256; f++)
                {
                    string Hex = "\u" + Padding.Substring(0, 4 - f.ToString().Length) + f;
                    string Dec = "&#" + Int32.Parse(f.ToString(), NumberStyles.HexNumber) + ";";
                    HTML = HTML.Replace(Hex, Dec);
                }
                HTML = System.Web.HttpUtility.HtmlDecode(HTML);