Currently it appears the only possible Date format for Date types in Proton Sheets is mm/dd/yyyy, which is US centric.

Would appreciate additionally including other date arrangements, perhaps:

dd/mm/yyyy (Common globally)
dd/mm/yy
yyyy/mm/dd (ISO 8601)
dd/mmm/yyyy

Would suggest dd/mm/yyyy given that it's arguably the most common format globally and yyyy-mm-dd given that it's the ISO 8601 international standard used heavily in software around the world should be priorities 👍