Using time in the mode or tab line can't be changed to European format (as far as I can see), the date in Europe is normally "weekday day month year hour:minutes" or in short "wkd, dd MMM yy HH:MM"
In GNU Emacs 29.0.50 (build 1, aarch64-apple-darwin20.6.0, NS appkit-2022.60 Version 11.6 (Build 20G165)) of 2021-10-20 built on macal.local Repository revision: 5f5189e9be6c70c4db99e8057287d16955b9c620 Repository branch: master Windowing system distributor 'Apple', version 10.3.2022 System Description: macOS 11.6
Important settings: value of $LANG: da_DK.UTF-8 locale-coding-system: utf-8
Major mode: Dashboard
Minor modes in effect: gcmh-mode: t global-emojify-mode: t emojify-mode: t pyvenv-mode: t projectile-mode: t global-git-gutter-mode: t org-super-agenda-mode: t global-flycheck-mode: t company-box-mode: t global-page-break-lines-mode: t page-break-lines-mode: t shell-dirtrack-mode: t dimmer-mode: t beacon-mode: t company-quickhelp-mode: t company-quickhelp-local-mode: t el-patch-use-package-mode: t company-statistics-mode: t global-company-mode: t company-mode: t ido-everywhere: t async-bytecomp-package-mode: t keyfreq-autosave-mode: t keyfreq-mode: t global-hl-line-mode: t global-display-line-numbers-mode: t ctrlf-mode: t ctrlf-local-mode: t all-the-icons-ivy-rich-mode: t ivy-rich-mode: t override-global-mode: t xterm-mouse-mode: t display-time-mode: t delete-selection-mode: t straight-use-package-mode: t straight-package-neutering-mode: t straight-live-modifications-mode: t tooltip-mode: t global-eldoc-mode: t show-paren-mode: t electric-indent-mode: t mouse-wheel-mode: t tool-bar-mode: t global-prettify-symbols-mode: t tab-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t buffer-read-only: t column-number-mode: t line-number-mode: t global-visual-line-mode: t transient-mark-mode: t