Currently the Inputs does not use the dateFormat file (if you could open an issue so we can make an update it would be awesome!). Anyway, you can change this line by adding the following props:
displayFormat="DD MMMM YYYY". In order to have the date displayed in French for instance you have to import the corresponding locale at the top of the same file: import 'moment/locale/fr'.
I hope it helps, good luck.