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