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 TeamStuart Matheson supported this idea ·
An error occurred while saving the commentStuart Matheson commented
I am experiencing this issue on tasks.office.com in Chrome and Firefox. No matter what date format I choose, after saving the settings and reloading the page, dates are still displayed m/d or mm/dd/yyyy.