what is the right way to parse JSON returned datetime field?

function updateChat(supplier_id, user_id, spantag) {
    $.ajax({
        type: "POST",
        url: "AjaxService/ChatService.asmx/GetChatBySupplierID",
        data: "{'supplier_id':'" + supplier_id + "', 'user_id':'" + user_id + "'}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (response) {
            var result = ($.parseJSON(response.d));

            var str="";
            for (var i = 0; i < result.length; i++) {
                str += "[" + parseJSONDate(result[i].chat_create_dt) + " " + result[i].usr_fname + "] " + result[i].chat_text;
                str += "";
            }
            $("#" + spantag).html(str);

            setTimeout(function () {
                updateChat(supplier_id,user_id, spantag)
            }, 3500);

        }
    });
}

function parseJSONDate(jsonDate) {
    var d = parseFloat(jsonDate.slice(6, 19) );
    return new Date(d).format("MM/dd/yyyy hh:mm:ss tt");
}

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