// In header: <boost/date_time/time_clock.hpp>
template<typename time_type> 
class second_clock {
public:
  // types
  typedef time_type::date_type          date_type;         
  typedef time_type::time_duration_type time_duration_type;
  // public static functions
  static time_type local_time();
  static time_type universal_time();
  template<typename time_zone_type> 
    static time_type local_time(boost::shared_ptr< time_zone_type >);
  // private static functions
  static time_type create_time(::std::tm *);
};