Boost日期处理

http://blog.csdn.net/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

stringdateexceptioniostreamcompileroutput

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>intmain() {    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-312008-Feb-292008-Mar-312008-Apr-302008-May-312008-Jun-302008-Jul-312008-Aug-312008-Sep-302008-Oct-312008-Nov-302008-Dec-31