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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This really needs to be fixed ASAP. We cannot work in MMDDYYYY, it's backwards and I keep getting dates mixed up. That is a critical failure of a product intended to help you not miss date of important events.
It has to display in DDMMYYYY for the rest of the world outside the US.