# time_periods.cpp

Demonstrate some simple uses of time periods.

    //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;
    }