Chris@16: #ifndef _GREGORIAN__CONVERSION_HPP___
Chris@16: #define _GREGORIAN__CONVERSION_HPP___
Chris@16: 
Chris@16: /* Copyright (c) 2004-2005 CrystalClear Software, Inc.
Chris@16:  * Use, modification and distribution is subject to the
Chris@16:  * Boost Software License, Version 1.0. (See accompanying
Chris@16:  * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  * Author: Jeff Garland, Bart Garst
Chris@101:  * $Date$
Chris@16:  */
Chris@16: 
Chris@16: #include <cstring>
Chris@16: #include <string>
Chris@16: #include <stdexcept>
Chris@16: #include <boost/throw_exception.hpp>
Chris@16: #include <boost/date_time/c_time.hpp>
Chris@16: #include <boost/date_time/special_defs.hpp>
Chris@16: #include <boost/date_time/gregorian/gregorian_types.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16: namespace gregorian {
Chris@16: 
Chris@16:   //! Converts a date to a tm struct. Throws out_of_range exception if date is a special value
Chris@16:   inline
Chris@16:   std::tm to_tm(const date& d)
Chris@16:   {
Chris@16:     if (d.is_special())
Chris@16:     {
Chris@16:         std::string s = "tm unable to handle ";
Chris@16:         switch (d.as_special())
Chris@16:         {
Chris@16:         case date_time::not_a_date_time:
Chris@16:             s += "not-a-date-time value"; break;
Chris@16:         case date_time::neg_infin:
Chris@16:             s += "-infinity date value"; break;
Chris@16:         case date_time::pos_infin:
Chris@16:             s += "+infinity date value"; break;
Chris@16:         default:
Chris@16:             s += "a special date value"; break;
Chris@16:         }
Chris@16:         boost::throw_exception(std::out_of_range(s));
Chris@16:     }
Chris@16: 
Chris@16:     std::tm datetm;
Chris@16:     std::memset(&datetm, 0, sizeof(datetm));
Chris@16:     boost::gregorian::date::ymd_type ymd = d.year_month_day();
Chris@16:     datetm.tm_year = ymd.year - 1900;
Chris@16:     datetm.tm_mon = ymd.month - 1;
Chris@16:     datetm.tm_mday = ymd.day;
Chris@16:     datetm.tm_wday = d.day_of_week();
Chris@16:     datetm.tm_yday = d.day_of_year() - 1;
Chris@16:     datetm.tm_isdst = -1; // negative because not enough info to set tm_isdst
Chris@16:     return datetm;
Chris@16:   }
Chris@16: 
Chris@16:   //! Converts a tm structure into a date dropping the any time values.
Chris@16:   inline
Chris@16:   date date_from_tm(const std::tm& datetm)
Chris@16:   {
Chris@16:     return date(static_cast<unsigned short>(datetm.tm_year+1900),
Chris@16:                 static_cast<unsigned short>(datetm.tm_mon+1),
Chris@16:                 static_cast<unsigned short>(datetm.tm_mday));
Chris@16:   }
Chris@16: 
Chris@16: } } //namespace boost::gregorian
Chris@16: 
Chris@16: #endif