Issue with changes to calendar control - new prop "keepInvalid"

[inquisitive]

The calendar control recently changed how it handles invalid dates typed into the input field. Originally the invalid text stayed in the input field and on blur was emitted. I was able to capture string input and put out an error message indicating the problem. The new prop keepInvalid allows the invalid text to be blanked out (when false - default) or leaves the invalid text (when true). This does work. However when keepInvalid is set tp true, the formatting of the display is now overridden. I am formatting the date to YYYY-MM-DD. It is however now displayed as standard (long format) JavaScript date. Is there a work around for this?

Thanks

Richard