Screenshot of dialog in settings of new Outlook, the options for the date format for September 1st are: 2024 minus 09 minus 01 9 slash 1 slash 2024 9 slash 1 slash 24 01 minus Sep minus 24 24 slash 09 slash 01 09 slash 01 slash 24 09 slash 01 slash 2024
https://files.ohai.social/media_attachments/files/112/716/445/576/691/641/original/1e20247df6cd2f1c.png