Boost C++ Libraries

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dates_as_strings.cpp

Various parsing and output of strings.

/*
The following is a simple example that shows conversion of dates to and 
from a std::string.

Expected output:
2001-Oct-09
2001-10-09
Tuesday October 9, 2001
An expected exception is next: 
  Exception: Month number is out of range 1..12

*/

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


int
main() 
{

  using namespace boost::gregorian;

  try {
    // The following date is in ISO 8601 extended format (CCYY-MM-DD)
    std::string s("2001-10-9"); //2001-October-05
    date d(from_string(s));
    std::cout << to_simple_string(d) << std::endl;
    
    //Read ISO Standard(CCYYMMDD) and output ISO Extended
    std::string ud("20011009"); //2001-Oct-09
    date d1(from_undelimited_string(ud));
    std::cout << to_iso_extended_string(d1) << std::endl;
    
    //Output the parts of the date - Tuesday October 9, 2001
    date::ymd_type ymd = d1.year_month_day();
    greg_weekday wd = d1.day_of_week();
    std::cout << wd.as_long_string() << " "
           << ymd.month.as_long_string() << " "
           << ymd.day << ", " << ymd.year
           << std::endl;


    //Let's send in month 25 by accident and create an exception
    std::string bad_date("20012509"); //2001-??-09
    std::cout << "An expected exception is next: " << std::endl;
    date wont_construct(from_undelimited_string(bad_date));
    //use wont_construct so compiler doesn't complain, but you wont get here!
    std::cout << "oh oh, you should reach this line: " 
           << to_iso_string(wont_construct) << std::endl;
  }
  catch(std::exception& e) {
    std::cout << "  Exception: " <<  e.what() << std::endl;
  }


  return 0;
}

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