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
An error occurred while saving the commentMarc Vanderhaegen commented
I still have the problem. In my profile, the Local is set to Always use my personal settings in French (Belgium) but when i go to the Planner web app and add a task, the date is still showed as MM/dd instead of dd/MM.