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68 lines
2.1 KiB
68 lines
2.1 KiB
#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: 2010-06-09 14:10:13 -0400 (Wed, 09 Jun 2010) $ |
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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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