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
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Mine is displaying the date in australian dd/mm/yyyy format, but interprets dates entered as US format. eg if I type in 01/03/2021 it comes up as 03/10/2021 Very confusing. Also the late tasks emails come in US date format.