#include <boost/date_time/posix_time/posix_time.hpp> 
#include <iostream> 

int main() 
{ 
  boost::posix_time::ptime pt1(boost::gregorian::date(2009, 1, 05), 
    boost::posix_time::time_duration(12, 0, 0)); 
  boost::posix_time::ptime pt2(boost::gregorian::date(2009, 1, 05), 
    boost::posix_time::time_duration(18, 30, 0)); 
  boost::posix_time::time_duration td = pt2 - pt1; 
  std::cout << td.hours() << std::endl; 
  std::cout << td.minutes() << std::endl; 
  std::cout << td.seconds() << std::endl; 
}