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 commentAnonymous commented
Although I'm glad the date has been resolved if you open Planner in Teams, the full standalone program needs to be updated for differing date formats as a lot of my production of plans is done in this environment.