k-grid leading zeros

HTML

<script src="http://cdn.kendostatic.com/2012.1.322/js/kendo.web.min.js"></script>
<link rel="stylesheet" href="http://cdn.kendostatic.com/2012.1.322/styles/kendo.common.min.css">
<link rel="stylesheet" href="http://cdn.kendostatic.com/2012.1.322/styles/kendo.default.min.css">
<div id="grid">
</div>

JavaScript

$("#grid").kendoGrid({
    dataSource: [
        {
        name: "John Doe",
        age: 9},
    {
        name: "John Doe",
        age: 122},
    {
        name: "John Doe",
        age: 27,
        }],
    columns: [
        {
        field: "name",
        title: "Name"},
    {
        field: "age",
        format: "{0:000000}" },
        template: "#=addZeros(age)#"}
    ],
    sortable: true
});

function addZeros(num) {
    var length = 6;
    var numStr = num.toString();
    while (numStr.length < length) {
        numStr = '0' + numStr;
    }

    return numStr;
}