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 TeamPIrkka supported this idea ·
An error occurred while saving the commentPIrkka commented
Still same issue in WEB version. It doesn't help to change the regional format in Office profile.