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 commentRowan commented
Yes, this needs to be tied to the Office365 settings. Users keep getting confused because every other date is in UK format but Planner, and only planner, is stuck in US format.