On my fresh install, the correct date/time formatting is showing under:
Settings > Language > Formats > Australia
Settings > Details > Date & Time
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https://bugs.launchpad.net/bugs/18
Public bug reported:
The calendar in the menu bar of gnome-shell is not adhering to the
localisation settings for Australia. The issue is displayed both in the
menu bar date and within the calendar popout as well. The localisation
configuration in the Settings appears to display correctly whilst t