ceph/src/boost/libs/date_time/example/gregorian/days_between_new_years.cpp

   1 /* Provides a simple example of using a date_generator, and simple
   2  * mathematical operatorations, to calculate the days since
   3  * New Years day of this year, and days until next New Years day.
   4  *
   5  * Expected results:
   6  * Adding together both durations will produce 365 (366 in a leap year).
   7  */
   8
   9 #include "boost/date_time/gregorian/gregorian.hpp"
  10 #include <iostream>
  11
  12 int
  13 main()
  14 {
  15
  16   using namespace boost::gregorian;
  17
  18   date today = day_clock::local_day();
  19   partial_date new_years_day(1,Jan);
  20   //Subtract two dates to get a duration
  21   days days_since_year_start = today - new_years_day.get_date(today.year());
  22   std::cout << "Days since Jan 1: " << days_since_year_start.days()
  23             << std::endl;
  24
  25   days days_until_year_start = new_years_day.get_date(today.year()+1) - today;
  26   std::cout << "Days until next Jan 1: " << days_until_year_start.days()
  27             << std::endl;
  28   return 0;
  29 }
  30
  31
  32 /*  Copyright 2001-2004: CrystalClear Software, Inc
  33  *  http://www.crystalclearsoftware.com
  34  *
  35  *  Subject to the Boost Software License, Version 1.0.
  36  * (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
  37  */
  38