//! Converts a date to a tm struct. Throws out_of_range exception if date is a special value
inline
std::tm to_tm(const date& d)
{
    if (d.is_special())
    {
        std::string s = "tm unable to handle ";
        switch (d.as_special())
        {
        case date_time::not_a_date_time:
            s += "not-a-date-time value";
            break;
        case date_time::neg_infin:
            s += "-infinity date value";
            break;
        case date_time::pos_infin:
            s += "+infinity date value";
            break;
        default:
            s += "a special date value";
            break;
        }
        boost::throw_exception(std::out_of_range(s));
    }

    std::tm datetm;
    std::memset(&datetm, 0, sizeof(datetm));
    boost::gregorian::date::ymd_type ymd = d.year_month_day();
    datetm.tm_year = ymd.year - 1900;
    datetm.tm_mon = ymd.month - 1;
    datetm.tm_mday = ymd.day;
    datetm.tm_wday = d.day_of_week();
    datetm.tm_yday = d.day_of_year() - 1;
    datetm.tm_isdst = -1; // negative because not enough info to set tm_isdst
    return datetm;
}
Ejemplo n.º 2
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  //! Converts a date to a tm struct. Throws out_of_range exception if date is a special value
  inline
  std::tm to_tm(const date& d) 
  {
    if(d.is_pos_infinity() || d.is_neg_infinity() || d.is_not_a_date()){
      std::string s = "tm unable to handle date value of ";
#if defined(USE_DATE_TIME_PRE_1_33_FACET_IO)
      s += to_simple_string(d);
#else
      std::ostringstream ss;
      ss << d;
      s += ss.str();
#endif // USE_DATE_TIME_PRE_1_33_FACET_IO
      boost::throw_exception(std::out_of_range(s));
    }
    std::tm datetm;
    boost::gregorian::date::ymd_type ymd = d.year_month_day();
    datetm.tm_year = ymd.year-1900; 
    datetm.tm_mon = ymd.month-1; 
    datetm.tm_mday = ymd.day;
    datetm.tm_wday = d.day_of_week();
    datetm.tm_yday = d.day_of_year()-1;
    datetm.tm_hour = datetm.tm_min = datetm.tm_sec = 0;
    datetm.tm_isdst = -1; // negative because not enough info to set tm_isdst
    return datetm;
  }