DD.MM.YYYY is the standard date format in my country (Switzerland) and in many other countries in Europe – see Date format by country - Wikipedia
As far as I know, this date format has been dropped in Logseq recently due to a technical problem.
We absolutely need it back. If I see a date in the DD-MM-YYYY format, my brain automatically tries to verify whether it is DD-MM-YYYY or MM-DD-YYYY. This causes a lot of distraction in my daily work.