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 commentJohn Leonard commented
I'd like to add my voice to this too - this really needs to change; my locale is set to UK everywhere I can find it and the planner data in teams is showing a UK format, so why on earth can't the web app do the same?
Also irritating to find that the last comment from MS was over a year ago.