The filter value has a date format that is not supported

I am trying to use filter by date in one of my lists. I am working in a Swedish version of SharePoint Online 2016. No matter what I do I always get an alert. In Swedish "Filtervärdet har ett datumformat som inte stöds", which in English is "The filter value has a date format that is not supported". I am using [Idag], alone and in combination with days increased or decreased, for example [Idag] +30. The filter [Idag] is similar to [Today]. The column used is a datetime type of column. I have tried to set it to long or short date.