Problem
Editor's datepicker can appear partially out of bounds when your date field is located near the edge of your browser. This applies to inline editing as well as in the dialog.
Example
You can see this behavior on the following page:
Simple Inline Editing
If you click to edit a start date so the datepicker appears, then start shrinking your web browser width while the datepicker remains open you can see where it becomes problematic and you cannot click on the last day of the week. In my case one of my date fields is the last in the table so it's always an issue regardless of browser size.