Import project file into PPM2006   

I try to import a project from a project file (mpp) against a project into 
project portfolio server 2006 and I obtain the following error: The string 
was not recognized as a valid DateTime.  There is a unknown word starting at 
index 0.

date: Wed, 3 Oct 2007 14:06:01 -0700   author:   Serge Locas