date format does not follow LC_TIME specification
I would like the date format to be YYYY-MM-DD. My OS is Linux Mint and all the locale variables are set to "en_DK.UTF-8", as revealed by querying "locale" in a terminal. Still the date is displayed as DD-MM-YYYY. I also tried to follow the guidelines in http://kb.mozillazine.org/Date_display_format but it did not work. The problem was already exposed in https://support.mozilla.org/en-US/questions/1265561.
Wubrane rozrisanje
The problem was solved elsewhere, the idea being to install the add-on Enhanced date formatter.
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Have you checked the preferences > Advanced >general setting that was introduced in I think V60 to give the option of Application Locale Vs Regional settings.
My guess is it is set to application locale and that is not en_DK.
It is set to "regional settings locale: English (Denmark)".
Wubrane rozrisanje
The problem was solved elsewhere, the idea being to install the add-on Enhanced date formatter.