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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_periods">
<title>Time Periods</title>
<para>
Demonstrate some simple uses of time periods.
</para>
<programlisting>
<![CDATA[
/* Some simple examples of constructing and calculating with times
* Returns:
* [2002-Feb-01 00:00:00/2002-Feb-01 23:59:59.999999999]
* contains 2002-Feb-01 03:00:05
* [2002-Feb-01 00:00:00/2002-Feb-01 23:59:59.999999999]
* intersected with
* [2002-Feb-01 00:00:00/2002-Feb-01 03:00:04.999999999]
* is
* [2002-Feb-01 00:00:00/2002-Feb-01 03:00:04.999999999]
*/
#include "boost/date_time/posix_time/posix_time.hpp"
#include <iostream>
using namespace boost::posix_time;
using namespace boost::gregorian;
//Create a simple period class to contain all the times in a day
class day_period : public time_period
{
public:
day_period(date d) : time_period(ptime(d),//midnight
ptime(d,hours(24)))
{}
};
int
main()
{
date d(2002,Feb,1); //an arbitrary date
//a period that represents a day
day_period dp(d);
ptime t(d, hours(3)+seconds(5)); //an arbitray time on that day
if (dp.contains(t)) {
std::cout << to_simple_string(dp) << " contains "
<< to_simple_string(t) << std::endl;
}
//a period that represents part of the day
time_period part_of_day(ptime(d, hours(0)), t);
//intersect the 2 periods and print the results
if (part_of_day.intersects(dp)) {
time_period result = part_of_day.intersection(dp);
std::cout << to_simple_string(dp) << " intersected with\n"
<< to_simple_string(part_of_day) << " is \n"
<< to_simple_string(result) << std::endl;
}
return 0;
}
]]>
</programlisting>
</section>
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