Re. the comma/dots.... this is just a language thing; it doesn't help, but in German, "eins-komma-zwei" means "one point two". Anyway...
The problem is that you're feeding the DATEVALUE() a string with dots... Excel doesn't like it. If you use "/" instead it should work:Personally, I wouldn't trust Excel's guessing skills.
You might be better using DATE(YEAR,MONTH,DAY) instead - to avoid ambiguity. It would look like this: (or whatever that function is called in German.
HTH
Tim
EDIT: it's "DATUM()"
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