Boost C++ Libraries

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print_month.cpp

Simple utility to print out days of the month with the days of a month. Demontstrates date iteration (date_time::date_itr).

/*
This example prints all the dates in a month. It demonstrates
the use of iterators as well as functions of the gregorian_calendar

Output:
Enter Year: 2002
Enter Month(1..12): 2
2002-Feb-01 [Fri]
2002-Feb-02 [Sat]
2002-Feb-03 [Sun]
2002-Feb-04 [Mon]
2002-Feb-05 [Tue]
2002-Feb-06 [Wed]
2002-Feb-07 [Thu]
*/

#include "boost/date_time/gregorian/gregorian.hpp"
#include <iostream>

int
main()
{
  std::cout << "Enter Year: ";
  int year, month;
  std::cin >> year;
  std::cout << "Enter Month(1..12): ";
  std::cin >> month;

  using namespace boost::gregorian;
  try {
    //Use the calendar to get the last day of the month
    int eom_day = gregorian_calendar::end_of_month_day(year,month);
    date endOfMonth(year,month,eom_day);

    //construct an iterator starting with first day of the month
    day_iterator ditr(date(year,month,1));
    //loop thru the days and print each one
    for (; ditr <= endOfMonth; ++ditr) {
      std::cout << *ditr << " ["
          << ditr->day_of_week() << "]"
          << std::endl; 
    }
  }
  catch(std::exception& e) {

    std::cout << "Error bad date, check your entry: \n"
           << "  Details: " << e.what() << std::endl;
  }
  return 0;
}

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