@DennisHendriks and here is the solution described Within this bug, that solved the situation for me in Firefox: we have to established intl.regional_prefs.use_os_locales to legitimate in about:config. This can adhere to functioning process locale and likewise use a date like DD/MM/YYYY in lieu of MM/DD/YYYY depending on your settings. – https://andredrclv.tribunablog.com/getting-my-do-my-java-homework-to-work-30752866