#ifndef _GREGORIAN__CONVERSION_HPP___ #define _GREGORIAN__CONVERSION_HPP___ /* Copyright (c) 2004-2005 CrystalClear Software, Inc. * Use, modification and distribution is subject to the * Boost Software License, Version 1.0. (See accompanying * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) * Author: Jeff Garland, Bart Garst * $Date: 2010-06-09 14:10:13 -0400 (Wed, 09 Jun 2010) $ */ #include <cstring> #include <string> #include <stdexcept> #include <boost/throw_exception.hpp> #include <boost/date_time/c_time.hpp> #include <boost/date_time/special_defs.hpp> #include <boost/date_time/gregorian/gregorian_types.hpp> namespace boost { namespace gregorian { //! 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; } //! Converts a tm structure into a date dropping the any time values. inline date date_from_tm(const std::tm& datetm) { return date(static_cast<unsigned short>(datetm.tm_year+1900), static_cast<unsigned short>(datetm.tm_mon+1), static_cast<unsigned short>(datetm.tm_mday)); } } } //namespace boost::gregorian #endif