Hi nealmcquaid ,
Please correct me if I misunderstood your meaning.
Power BI users often use different browsers to connect to the Power BI service, such as Edge, Chrome, or Internet Explorer.
Problems arise when the default date format on these browsers differs from the format required by the user, resulting in some challenges in understanding the date.
To meet your needs, you will need to set the browser language to English (UK) and change the language to the browser default language in the language settings of the Power BI service.
(British English and American English are indistinguishable in Power BI Service)
Articles for your reference: How to Manage Date Formats in the Power BI Service
Also，You can set this up in Power BI Desktop when you create the report
Hope it helps,
Best Regards,
Community Support Team _ Caitlyn