template<typename time_type, typename dst_rules> 
class dynamic_local_time_adjustor {
public:
  // types
  typedef time_type::time_duration_type time_duration_type;
  typedef time_type::date_type          date_type;         

  // construct/copy/destruct
  dynamic_local_time_adjustor(time_duration_type);

  // public member functions
  time_duration_type utc_offset(bool) ;
};