As an update, since we’ve still been seeing issues around date formatting, so we’re pursuing another fix that should help: If you’re using Planner within Teams, we will default to using the same language/local as Teams.
If you’re seeing this issue persist outside of Teams and your language/locale is set properly for your Office account, please let us know in the comments below!
The Planner Team
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Agreed with Anonymous April 13... Is there a way to set default planner (in browser) links to include /en-au/ based on Tennant location?
Anonymous April 13 - I've found that if your personal account (language) settings in Teams is set to 'English AU' then the date format seems to format correctly based on those... but still doesn't reformat in browser.