# Flight Time Example

This example shows a program that calculates the arrival time of a plane that flys from Phoenix to New York. During the flight New York shifts into daylight savings time (Phoenix doesn't because Arizona doesn't use dst).

    #include "boost/date_time/local_time/local_time.hpp"
    #include <iostream>

    /* This example shows a program that calculates the arrival time of a plane
     * that flys from Phoenix to New York.  During the flight New York shifts
     * into daylight savings time (Phoenix doesn't because Arizona doesn't use
     * dst).
     *
     *
     */

    int main()
    {
      using namespace boost::gregorian;
      using namespace boost::local_time;
      using namespace boost::posix_time;

      //setup some timezones for creating and adjusting local times
      //This user editable file can be found in libs/date_time/data.
      tz_database tz_db;
      tz_db.load_from_file("date_time_zonespec.csv");
      time_zone_ptr nyc_tz = tz_db.time_zone_from_region("America/New_York");
      //Use a
      time_zone_ptr phx_tz(new posix_time_zone("MST-07:00:00"));

      //local departure time in phoenix is 11 pm on april 2 2005
      // (ny changes to dst on apr 3 at 2 am)
      local_date_time phx_departure(date(2005, Apr, 2), hours(23),
                                    phx_tz,
                                    local_date_time::NOT_DATE_TIME_ON_ERROR);

      time_duration flight_length = hours(4) + minutes(30);
      local_date_time phx_arrival = phx_departure + flight_length;
      local_date_time nyc_arrival = phx_arrival.local_time_in(nyc_tz);

      std::cout << "departure phx time: " << phx_departure << std::endl;
      std::cout << "arrival phx time:   " << phx_arrival << std::endl;
      std::cout << "arrival nyc time:   " << nyc_arrival << std::endl;

    }