ceph/src/boost/libs/date_time/example/local_time/flight.cpp

   1
   2 #include "boost/date_time/local_time/local_time.hpp"
   3 #include <iostream>
   4
   5 /* This example shows a program that calculates the arrival time of a plane
   6  * that flys from Phoenix to New York.  During the flight New York shifts
   7  * into daylight savings time (Phoenix doesn't because Arizona doesn't use
   8  * DST).
   9  *
  10  *
  11  */
  12
  13 int main()
  14 {
  15   using namespace boost::gregorian;
  16   using namespace boost::local_time;
  17   using namespace boost::posix_time;
  18
  19
  20   //setup some timezones for creating and adjusting local times
  21   //This user editable file can be found in libs/date_time/data.
  22   tz_database tz_db;
  23   try {
  24     tz_db.load_from_file("../../data/date_time_zonespec.csv");
  25   }catch(const data_not_accessible& dna) {
  26     std::cerr << "Error with time zone data file: " << dna.what() << std::endl;
  27     exit(EXIT_FAILURE);
  28   }catch(const bad_field_count& bfc) {
  29     std::cerr << "Error with time zone data file: " << bfc.what() << std::endl;
  30     exit(EXIT_FAILURE);
  31   }
  32   time_zone_ptr nyc_tz = tz_db.time_zone_from_region("America/New_York");
  33   //Use a newly created time zone rule
  34   time_zone_ptr phx_tz(new posix_time_zone("MST-07:00:00"));
  35
  36   //local departure time in Phoenix is 11 pm on March 13 2010
  37   // (NY changes to DST on March 14 at 2 am)
  38   local_date_time phx_departure(date(2010, Mar, 13), hours(23),
  39                                 phx_tz,
  40                                 local_date_time::NOT_DATE_TIME_ON_ERROR);
  41   local_date_time nyc_departure = phx_departure.local_time_in(nyc_tz);
  42
  43   time_duration flight_length = hours(4) + minutes(30);
  44   local_date_time phx_arrival = phx_departure + flight_length;
  45   local_date_time nyc_arrival = phx_arrival.local_time_in(nyc_tz);
  46
  47   std::cout << "departure PHX time: " << phx_departure << std::endl;
  48   std::cout << "departure NYC time: " << nyc_departure << std::endl;
  49   std::cout << "arrival PHX time:   " << phx_arrival << std::endl;
  50   std::cout << "arrival NYC time:   " << nyc_arrival << std::endl;
  51
  52 }
  53
  54
  55 /*  Copyright 2005: CrystalClear Software, Inc
  56  *  http://www.crystalclearsoftware.com
  57  *
  58  *  Subject to the Boost Software License, Version 1.0.
  59  * (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
  60  */