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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE library PUBLIC "-//Boost//DTD BoostBook XML V1.0//EN"
"../../../tools/boostbook/dtd/boostbook.dtd">
<!-- Copyright (c) 2001-2004 CrystalClear Software, Inc.
Subject to the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
-->
<section id="date_time.examples.time_math">
<title>Time Math</title>
<para>
Various types of calculations with times and time durations.
</para>
<programlisting>
<![CDATA[
/* Some simple examples of constructing and calculating with times
* Output:
* 2002-Feb-01 00:00:00 - 2002-Feb-01 05:04:02.001000000 = -5:04:02.001000000
*/
#include "boost/date_time/posix_time/posix_time.hpp"
#include <iostream>
int
main()
{
using namespace boost::posix_time;
using namespace boost::gregorian;
date d(2002,Feb,1); //an arbitrary date
//construct a time by adding up some durations durations
ptime t1(d, hours(5)+minutes(4)+seconds(2)+millisec(1));
//construct a new time by subtracting some times
ptime t2 = t1 - hours(5)- minutes(4)- seconds(2)- millisec(1);
//construct a duration by taking the difference between times
time_duration td = t2 - t1;
std::cout << to_simple_string(t2) << " - "
<< to_simple_string(t1) << " = "
<< to_simple_string(td) << std::endl;
return 0;
}
]]>
</programlisting>
</section>
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