ceph/src/boost/libs/date_time/example/gregorian/dates_as_strings.cpp

   1 /* The following is a simple example that shows conversion of dates
   2  * to and from a std::string.
   3  *
   4  * Expected output:
   5  * 2001-Oct-09
   6  * 2001-10-09
   7  * Tuesday October 9, 2001
   8  * An expected exception is next:
   9  * Exception: Month number is out of range 1..12
  10  */
  11
  12 #include "boost/date_time/gregorian/gregorian.hpp"
  13 #include <iostream>
  14 #include <string>
  15
  16 int
  17 main()
  18 {
  19
  20   using namespace boost::gregorian;
  21
  22   try {
  23     // The following date is in ISO 8601 extended format (CCYY-MM-DD)
  24     std::string s("2001-10-9"); //2001-October-09
  25     date d(from_simple_string(s));
  26     std::cout << to_simple_string(d) << std::endl;
  27
  28     //Read ISO Standard(CCYYMMDD) and output ISO Extended
  29     std::string ud("20011009"); //2001-Oct-09
  30     date d1(from_undelimited_string(ud));
  31     std::cout << to_iso_extended_string(d1) << std::endl;
  32
  33     //Output the parts of the date - Tuesday October 9, 2001
  34     date::ymd_type ymd = d1.year_month_day();
  35     greg_weekday wd = d1.day_of_week();
  36     std::cout << wd.as_long_string() << " "
  37               << ymd.month.as_long_string() << " "
  38               << ymd.day << ", " << ymd.year
  39               << std::endl;
  40
  41     //Let's send in month 25 by accident and create an exception
  42     std::string bad_date("20012509"); //2001-??-09
  43     std::cout << "An expected exception is next: " << std::endl;
  44     date wont_construct(from_undelimited_string(bad_date));
  45     //use wont_construct so compiler doesn't complain, but you wont get here!
  46     std::cout << "oh oh, you shouldn't reach this line: "
  47               << to_iso_string(wont_construct) << std::endl;
  48   }
  49   catch(std::exception& e) {
  50     std::cout << "  Exception: " <<  e.what() << std::endl;
  51   }
  52
  53
  54   return 0;
  55 }
  56
  57 /*  Copyright 2001-2004: CrystalClear Software, Inc
  58  *  http://www.crystalclearsoftware.com
  59  *
  60  *  Subject to the Boost Software License, Version 1.0.
  61  * (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
  62  */
  63