926 votesthinking about it · AdminMicrosoft 365 Groups Feedback (Product Owner, Microsoft Office 365) responded
We’re considering how this could be implemented across the group identity.
An error occurred while saving the commentAnonymous commented
group URL: /_layouts/15/regionalsetng.aspx?noredirect=true does not let you save changes MS support have confirmed this is "by design".
This forcing of US date formats on non US companies makes the product unusable for holding work related documents that contain dates. For example an appointment in a spreadsheet for 01/12/2016 (1st of December 2016) will show as 12/01/2016 (12th January 2016) with potentially disastrous results.