剑道网格导出日期格式不正确

这个Warranty\u Start\u日期在我的表列中可以为空,下面是网格列的模板。

    customColumns.push({
       title: customHeaders[i],
       field: headers[i],
       width: 150,
       template:
           "#= " + headers[i] + " ? kendo.toString(kendo.parseDate(" + headers[i] + "), 'dd/MM/yyyy') : 'N/A' #",
    });

对于网格,我启用了excel导出功能,并尝试自定义特定列的格式:

            var grid = $("#gridHardwares").kendoGrid({
        excel: {
            fileName: "excelfile.xlsx",
            allPages: true,
            filterable:true
        },
        excelExport: function(e) {
            var sheet = e.workbook.sheets[0];

            for (var rowIndex = 1; rowIndex < sheet.rows.length; rowIndex++) {
                var row = sheet.rows[rowIndex];
                for (var cellIndex = 0; cellIndex < row.cells.length; cellIndex ++) {
                    if (cellIndex >= 9 && cellIndex <= 11)
                    {
                        row.cells[cellIndex].format = "yy-MM-dd hh:mm:ss";
                    }
                    if (cellIndex >= 13)
                        row.cells[cellIndex].format = "0.00";
                }
            }
        },

我不明白,因为这个小数点后两位的格式很好用,但日期格式不行。 excel中的导出结果: date is not in readable format

            excelExport: function(e) {
            var sheet = e.workbook.sheets[0];
            var template = kendo.template(this.columns[13].template);
            for (var rowIndex = 1; rowIndex < sheet.rows.length; rowIndex++) {
                var row = sheet.rows[rowIndex];

                for (var cellIndex = 0; cellIndex < row.cells.length; cellIndex ++) {
                    if (cellIndex >= 9 && cellIndex <= 11)
                    {
                        var dataItem = {
                            Warranty_Start_Date: row.cells[13].value
                        };

                        row.cells[13].value = template(dataItem);
                        row.cells[cellIndex].format = "yy-MM-dd hh:mm:ss";
                    }
                    if (cellIndex >= 13)
                        row.cells[cellIndex].format = "0.00";
                }
            }
        },

error occur when export