#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 |