67 lines
1.8 KiB
XML
67 lines
1.8 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.print_hours">
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<title>Print Hours</title>
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<para>
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Demonstrate time iteration, clock retrieval, and simple calculation.
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</para>
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<programlisting>
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<![CDATA[
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/* Print the remaining hours of the day
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* Uses the clock to get the local time
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* Use an iterator to iterate over the remaining hours
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* Retrieve the date part from a time
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*
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* Expected Output something like:
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*
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* 2002-Mar-08 16:30:59
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* 2002-Mar-08 17:30:59
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* 2002-Mar-08 18:30:59
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* 2002-Mar-08 19:30:59
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* 2002-Mar-08 20:30:59
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* 2002-Mar-08 21:30:59
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* 2002-Mar-08 22:30:59
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* 2002-Mar-08 23:30:59
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* Time left till midnight: 07:29:01
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*/
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#include "boost/date_time/posix_time/posix_time.hpp"
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#include <iostream>
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int
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main()
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{
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using namespace boost::posix_time;
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using namespace boost::gregorian;
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//get the current time from the clock -- one second resolution
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ptime now = second_clock::local_time();
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//Get the date part out of the time
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date today = now.date();
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date tommorrow = today + days(1);
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ptime tommorrow_start(tommorrow); //midnight
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//iterator adds by one hour
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time_iterator titr(now,hours(1));
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for (; titr < tommorrow_start; ++titr) {
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std::cout << to_simple_string(*titr) << std::endl;
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}
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time_duration remaining = tommorrow_start - now;
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std::cout << "Time left till midnight: "
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<< to_simple_string(remaining) << 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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