<script>

        function ChangeDateFormat(cellval) {

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

            var month = date.getMonth() + 1 < 10 ? "0" + (date.getMonth() + 1) : date.getMonth() + 1;

            var currentDate = date.getDate() < 10 ? "0" + date.getDate() : date.getDate();

            var hour = date.getHours() < 10 ? "0" + date.getHours() : date.getHours();

            var second = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds();

            var milions = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes();

            return date.getFullYear() + "-" + month + "-" + currentDate + " " + hour + ":" + second + ":" + milions;

        }

</script>