@DennisHendriks and Here's the solution stated With this bug, that solved the condition for me in Firefox: we have to established intl.regional_prefs.use_os_locales to accurate in about:config. This will likely follow running method locale and in addition use a date like DD/MM/YYYY as opposed to MM/DD/YYYY according to your configurations. – https://archerklgas.designi1.com/38040387/the-answer-homework-questions-for-free-diaries