49 lines
1.5 KiB
XML
49 lines
1.5 KiB
XML
<?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>
|