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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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