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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Absolute nonsense. Using Planner via Office 365, not embedded in Teams. The date format here in Australia is wrong - this renders the product worse than useless as it is providing incorrect information.