Boost日期处理

http://blog.youkuaiyun.com/firebird321/article/details/2559103

Boost日期处理

分类： C/C++相关 2008-06-17 23:38  1695人阅读  评论(2)  收藏  举报

string date exception iostream compiler output

日期转换为数字

  #include "boost/date_time/gregorian/gregorian.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-09
      date d(from_simple_string(s));
      std::cout << to_simple_string(d) << std::endl;  //2001-Oct-09      

      //Read ISO Standard(CCYYMMDD) and output ISO Extended
      std::string ud("20011009"); //2001-Oct-09
      date d1(from_undelimited_string(ud));
      //2001-10-09
      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();
      //Tuesday October 9, 2001
      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!
      //An expected exception is next:
      //exception: Month number is out of range 1..12
      std::cout << "oh oh, you shouldn't reach this line: " 
                << to_iso_string(wont_construct) << std::endl;
    }
    catch(std::exception& e) {
      std::cout << "  Exception: " <<  e.what() << std::endl;
    }


    return 0;
  }


计算给定日期与当前日期的差
#include "boost/date_time/gregorian/gregorian.hpp"
#include <iostream>

int
main() 
{
  
  using namespace boost::gregorian;
  std::string s;
  std::cout << "Enter birth day YYYY-MM-DD (eg: 2002-02-01): ";
  std::cin >> s;
  try {
    date birthday(from_simple_string(s));
    date today = day_clock::local_day();  
    days days_alive = today - birthday;
    days one_day(1);
    if (days_alive == one_day) {
      std::cout << "Born yesterday, very funny" << std::endl;
    }
    else if (days_alive < days(0)) {
      std::cout << "Not born yet, hmm: " << days_alive.days() 
                << " days" <<std::endl;
    }
    else {
      std::cout << "Days alive: " << days_alive.days() << std::endl;
    }

  }
  catch(...) {
    std::cout << "Bad date entered: " << s << std::endl;
  }
  return 0;
}

输出结果：
（假设当前日期为 2008-6-23）
如果输入： 2008-6-22；        输出结果为 Born yesterday, very funny
如果输入： 2008-06-21；       输出结果为 Days alive: 2
如果输入： 2008-06-24；       输出结果为 Not born yet, hmm: -1 days


获得当前日期是本年的第几天；
计算当前日期离下一年的给定日期距离多少天
#include <iostream>
#include "boost/date_time/gregorian/gregorian.hpp"

  int
  main() 
  {
    
    using namespace boost::gregorian;

    date today = day_clock::local_day();
    //Jan 这个宏表示 1 月
    /* 1 - 12 月的宏定义如下
       Jan;Feb;Mar;Apr;May;Jun;Jul;Aug;Sep;Oct;Nov;Dec;
       
       这两个宏我没搞清楚是什么定义，暂时放一下 
       NotAMonth;NumMonths;
    */
    partial_date new_years_day(1,Jan);
    //Subtract two dates to get a duration
    days days_since_year_start = today - new_years_day.get_date(today.year());
    std::cout << "Days since Jan 1: " << days_since_year_start.days() 
              << std::endl;
    
    days days_until_year_start = new_years_day.get_date(today.year()+1) - today;
    std::cout << "Days until next Jan 1: " << days_until_year_start.days() 
              << std::endl;
    return 0;
  };

输出结果：
（假设当前日期为 2008-6-23）
Days since Jan 1: 174        （表示距离08年1月1日，相隔 174 天）
Days until next Jan 1: 192   （表示距离09年1月1日，相差 192 天）


给定年月，获得剩下年月的天数
int
  main()
  {
    using namespace boost::gregorian;
    
    greg_year year(1400);
    greg_month month(1);

    // get a month and a year from the user
    try {
      int y, m;
      std::cout << "   Enter Year(ex: 2002): ";
      std::cin >> y;
      year = greg_year(y);
      std::cout << "   Enter Month(1..12): ";
      std::cin >> m;
      month = greg_month(m);
    }
    catch(bad_year by) {
      std::cout << "Invalid Year Entered: " << by.what() << '/n'
        << "Using minimum values for month and year." << std::endl;
    }
    catch(bad_month bm) {
      std::cout << "Invalid Month Entered" << bm.what() << '/n'
        << "Using minimum value for month. " << std::endl;
    }
    
    date start_of_next_year(year+1, Jan, 1);
    date d(year, month, 1);
    
    // add another month to d until we enter the next year.
    while (d < start_of_next_year){
      std::cout << to_simple_string(d.end_of_month()) << std::endl;
      d += months(1);
    }

    return 0;
  }


输入： 2008（回车） 12（回车）
输出结果： 2008-Dec-31


输入： 2008（回车） 1（回车）
输出结果： 
2008-Jan-31
2008-Feb-29
2008-Mar-31
2008-Apr-30
2008-May-31
2008-Jun-30
2008-Jul-31
2008-Aug-31
2008-Sep-30
2008-Oct-31
2008-Nov-30
2008-Dec-31