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#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
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