Form in Design Studio will not convert the time format upon language selection.
English form with date format dd/mm/yyyy
Below is a form using settings with form language selecting German. The date format remains the same "dd/mm/yyyy" when the expected value should be "tt/mm/jjjj" as per language date format
This behaviour is related to the browser language settings. It automatically translates the date in the format of the selected language in the browser.
Example of the same form with different browser language selected, the date format is changed by the browser