This worked for me:
BO - 'Collection Manipulation'
Action - 'Filter Collection'
______________________
Collection In : your collection with dates
Filter : ""date < '"" & ToDate(FormatDate(Today(), ""MM/dd/yyyy"")) & ""'""
(date = column name)
Maybe you'll need to play with formatting a bit, I just created some custom collection and it took system format (in your case it might be ""dd.MM.yyyy"" instead).