I was able to duplicate an issue I found when we upgraded to the latest Kendo UI for jQuery release. The DatePicker is not working correctly when the kendo namespace, kendo.ns, is set. I was able to duplicate it using the MVVM demo example for DatePicker. The month is no longer displayed and clicking on the Month to zoom out in time stops working as well. I have not checked what other functionality is not working. I do know the parsing is working properly as well as formatting.
<!DOCTYPE html>
<html>
<head>
<base href="https://demos.telerik.com/kendo-ui/datepicker/mvvm">
<style>html { font-size: 14px; font-family: Arial, Helvetica, sans-serif; }</style>
<title></title>
<link rel="stylesheet" href="https://kendo.cdn.telerik.com/2020.2.617/styles/kendo.common.min.css" />
<link rel="stylesheet" href="https://kendo.cdn.telerik.com/2020.2.617/styles/kendo.metroblack.min.css" />
<link rel="stylesheet" href="https://kendo.cdn.telerik.com/2020.2.617/styles/kendo.metroblack.mobile.min.css" />
<script src="https://kendo.cdn.telerik.com/2020.2.617/js/jquery.min.js"></script>
<script src="https://kendo.cdn.telerik.com/2020.2.617/js/kendo.all.min.js"></script>
<link rel="stylesheet" href="../content/shared/styles/examples-offline.css">
<script src="../content/shared/js/console.js"></script>
<script>
// set the kendo namespace so not to collide with other libraries
kendo.ns = "kendo-";
</script>
</head>
<body>
<div id="example">
<div class="demo-section k-content">
<div>
<h4>Choose a date</h4>
<input data-kendo-role="datepicker"
data-kendo-bind="visible: isVisible,
enabled: isEnabled,
value: selectedDate,
events: { change: onChange }"
style="width: 100%">
</div>
<div style="padding-top: 2em;">
<h4>Console</h4>
<div class="console"></div>
</div>
</div>
<div class="box">
<div class="box-col">
<h4>Configuration</h4>
<div>
<label><input type="checkbox" data-bind="checked: isEnabled">Enable</label>
</div>
<div>
<label><input type="checkbox" data-bind="checked: isVisible">Visible</label>
</div>
</div>
<div class="box-col">
<h4>Information</h4>
Kendo UI DatePicker supports the
<a href="https://docs.telerik.com/kendo-ui/getting-started/framework/mvvm/bindings/enabled">enabled</a>,
<a href="https://docs.telerik.com/kendo-ui/getting-started/framework/mvvm/bindings/events">events</a>,
<a href="https://docs.telerik.com/kendo-ui/getting-started/framework/mvvm/bindings/value">value</a> and
<a href="https://docs.telerik.com/kendo-ui/getting-started/framework/mvvm/bindings/visible">visible</a> bindings.
</div>
</div>
<script>
var viewModel = kendo.observable({
selectedDate: null,
isEnabled: true,
isVisible: true,
onChange: function() {
kendoConsole.log("event :: change (" + kendo.toString(this.get("selectedDate"), "D") + ")");
}
});
kendo.bind($("#example"), viewModel);
</script>
</div>
</body>
</html>