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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The date format of Planner when viewing in Teams can be changed. In the Teams desktop client, click on your photo and select Settings (cog), then on the General tab you will see Language. Change the first entry of App Language determines the date and time format to your locale.
Thanks Microsoft for fixing, but please try to: 1 - be better with your defaults as most people aren't in the USA. 2 - educate everyone on where to change settings, this was hard to find