Date picker

This is intended to be used as a filter. After selecting a start date, the next date is automatically selected.

Modals trap focus and watch a few document level events. In order to place a date picker in a modal:

• To avoid the modal's escape press event handler from overruling the date picker's escape press handlers, use the DatePickerRef to close the calendar when it is open and the escape key is pressed.
• Append the calendar to the modal to keep it as close to the date picker in the DOM while maintaining correct layouts visually In order to place a time picker in the modal, its menu must be appended to the time picker's parent.