//yyyy-MM-dd HH:mm:SS

         function JsonDateToDate(jsondate) {

             var date = new Date(parseInt(jsondate.replace("/Date(", "").replace(")/", ""), 10));

             var year = date.getFullYear();

             var month = date.getMonth() + 1;

             var day = date.getDate();

             var hh = date.getHours();

             var mm = date.getMinutes();

             var ss = date.getSeconds();

             return year + "-" + month + "-" + day + " " + hh + ":" + mm + ":" + ss;

         }

         var date = "/Date(1379944571737)/";

         alert(JsonDateToDate(date));