Support date value in shapefile
As far as I can see, Db3 does support "date format" with a 'D' char after the attribute name. I had an hex look with Neo to the dbf file I sent, you can see that it's a Dbase '3' and that there is a 'D' after cl_creadat. That's likely why Qgis table manager plugin recognizes also it as Date.
Date field types are now supported in our Shapefiles, and properly filled when converting from an OgrLayer (using GetBuffer).