template<typename date_type, typename facet_type, typename charT = char> 
class ostream_date_formatter {
public:
  // types
  typedef std::basic_ostream< charT > ostream_type;
  typedef date_type::ymd_type         ymd_type;    

  // public static functions
  void date_put(const date_type &, ostream_type &, const facet_type &) ;
  void date_put(const date_type &, ostream_type &) ;
};