# Print Hours

Demonstrate time iteration, clock retrieval, and simple calculation.

      /* 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;
      }