//yyyy-MM-dd

function JsonToDate(jsondate) {

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

    return getDate(date);

}      

 function getDate(date) {

            var year = date.getFullYear();

            var month = date.getMonth() + 1;

            var day = date.getDate();

            return year + "-" + month + "-" + day;

        }

//yyyy-MM-dd hh:mm:ss

function JsonToDateTime(jsondate) {

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

    return getDateTime(date);

} 

        function getDateTime(date) {

            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;

        }