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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.print_hours">
- <title>Print Hours</title>
- <para>
- Demonstrate time iteration, clock retrieval, and simple calculation.
- </para>
- <programlisting>
- <![CDATA[
- /* Print the remaining hours of the day
- * Uses the clock to get the local time
- * Use an iterator to iterate over the remaining hours
- * Retrieve the date part from a time
- *
- * Expected Output something like:
- *
- * 2002-Mar-08 16:30:59
- * 2002-Mar-08 17:30:59
- * 2002-Mar-08 18:30:59
- * 2002-Mar-08 19:30:59
- * 2002-Mar-08 20:30:59
- * 2002-Mar-08 21:30:59
- * 2002-Mar-08 22:30:59
- * 2002-Mar-08 23:30:59
- * Time left till midnight: 07:29:01
- */
- #include "boost/date_time/posix_time/posix_time.hpp"
- #include <iostream>
- int
- main()
- {
- using namespace boost::posix_time;
- using namespace boost::gregorian;
- //get the current time from the clock -- one second resolution
- ptime now = second_clock::local_time();
- //Get the date part out of the time
- date today = now.date();
- date tommorrow = today + days(1);
- ptime tommorrow_start(tommorrow); //midnight
- //iterator adds by one hour
- time_iterator titr(now,hours(1));
- for (; titr < tommorrow_start; ++titr) {
- std::cout << to_simple_string(*titr) << std::endl;
- }
-
- time_duration remaining = tommorrow_start - now;
- std::cout << "Time left till midnight: "
- << to_simple_string(remaining) << std::endl;
- return 0;
- }
- ]]>
- </programlisting>
- </section>
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