Hello,
Thank you for posting in Q&A forum.
If you want to verify Power BI Desktop default number and date formatting, please refer to
Supported languages and countries/regions for Power BI - Power BI | Microsoft Learn
and in Power BI, we can manually change datetime format as follow:
or use DAX function to change format, here's an example:
Hope this answer can help you well.
Best regards,
Jill Zhou