[Orgmode] German date in LaTeX export [7.3]

[phaebz]

I have these org-options set for export:

#+LANGUAGE:  de
#+LATEX_HEADER: \usepackage[ngerman]{babel}

The usepackage line for babel is necessary, because Language: de is not 
recognized. With the above, I correctly get e.g. "Inhaltsverzeichnis" instead 
of "Contents". But the timestamp in the title remains the english one, namely 
"13 February 2011".

How do I change this? I did not find any option for this in the manual...

Thanks in advance

Michael Bach