calendar.cpp

Example of using date_time functions for generating calendar for current year.

//
//  Copyright (c) 2009-2010 Artyom Beilis (Tonkikh)
//
//  Distributed under the Boost Software License, Version 1.0. (See
//  accompanying file LICENSE_1_0.txt or copy at
//  http://www.boost.org/LICENSE_1_0.txt)
//
#include <boost/locale.hpp>
#include <iomanip>
#include <ctime>

int main(int argc,char **argv)
{
     using namespace boost::locale;
     generator gen;
     gen.octet_encoding("UTF-8");

     // Setup environment

     if(argc>=2)
          std::locale::global(gen(argv[1]));
     else
          std::locale::global(gen("")); // system default

     boost::locale::date_time now;
     
     date_time start=now;

     // Set the first day of the first month of this year
     start.set(period::month,now.minimum(period::month));
     start.set(period::day,start.minimum(period::day));

     int current_year = now / period::year;

     std::cout.imbue(std::locale());

     // Display current year
     std::cout << format("{1,ftime='%Y'}") % now << std::endl;

     //
     // Run forward untill current year is the date
     //
     for(now=start;now / period::year == current_year;) {
          
          // Print heading of month
          if(calendar().is_gregorian()) 
               std::cout << format("{1,ftime='%B'}") % now <<std::endl;
          else
               std::cout << format("{1,ftime='%B'} ({1,ftime='%Y-%m-%d',locale=en} - {2,locale=en,ftime='%Y-%m-%d'})")
                         % now 
                         % date_time(now,now.maximum(period::day)*period::day) << std::endl;

          int first = calendar().first_day_of_week();

          // Print weeks days
          for(int i=0;i<7;i++) {
               date_time tmp(now,period::day_of_week * (first + i));
               std::cout << format("{1,w=8,ftime='%a'} ") % tmp;
          }
          std::cout << std::endl;

          int current_month = now / period::month;
          int skip = now / period::day_of_week_local - 1;
          for(int i=0;i<skip*9;i++)
               std::cout << ' ';
          for(;now / period::month == current_month ;now += period::day) {
               std::cout << format("{1,w=8,ftime='%e'} ") % now;     
               if(now / period::day_of_week_local == 7)
                    std::cout << std::endl;
          }
          std::cout << std::endl;
     }

}
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