50 lines
1.5 KiB
XML
50 lines
1.5 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
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"../../../tools/boostbook/dtd/boostbook.dtd">
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<!-- Copyright (c) 2001-2004 CrystalClear Software, Inc.
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Subject to the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
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-->
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<section id="date_time.examples.days_between_new_year">
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<title>Days Between New Years</title>
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<para>
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Calculate the number of days till new years
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</para>
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<programlisting>
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<![CDATA[
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/* Provides a simple example of using a date_generator, and simple
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* mathematical operatorations, to calculate the days since
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* New Years day of this year, and days until next New Years day.
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*
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* Expected results:
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* Adding together both durations will produce 366 (365 in a leap year).
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*/
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#include <iostream>
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#include "boost/date_time/gregorian/gregorian.hpp"
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int
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main()
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{
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using namespace boost::gregorian;
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date today = day_clock::local_day();
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partial_date new_years_day(1,Jan);
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//Subtract two dates to get a duration
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days days_since_year_start = today - new_years_day.get_date(today.year());
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std::cout << "Days since Jan 1: " << days_since_year_start.days()
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<< std::endl;
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days days_until_year_start = new_years_day.get_date(today.year()+1) - today;
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std::cout << "Days until next Jan 1: " << days_until_year_start.days()
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<< std::endl;
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return 0;
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};
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]]>
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</programlisting>
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</section>
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