73 lines
2.6 KiB
C++
73 lines
2.6 KiB
C++
#ifndef DATE_TIME_C_LOCAL_TIME_ADJUSTOR_HPP__
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#define DATE_TIME_C_LOCAL_TIME_ADJUSTOR_HPP__
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/* Copyright (c) 2002,2003,2005 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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/*! @file c_local_time_adjustor.hpp
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Time adjustment calculations based on machine
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*/
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#include <stdexcept>
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#include <boost/throw_exception.hpp>
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#include <boost/date_time/compiler_config.hpp>
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#include <boost/date_time/c_time.hpp>
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#include <boost/numeric/conversion/cast.hpp>
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namespace boost {
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namespace date_time {
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//! Adjust to / from utc using the C API
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/*! Warning!!! This class assumes that timezone settings of the
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* machine are correct. This can be a very dangerous assumption.
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*/
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template<class time_type>
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class c_local_adjustor {
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public:
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typedef typename time_type::time_duration_type time_duration_type;
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typedef typename time_type::date_type date_type;
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typedef typename date_type::duration_type date_duration_type;
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//! Convert a utc time to local time
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static time_type utc_to_local(const time_type& t)
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{
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date_type time_t_start_day(1970,1,1);
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time_type time_t_start_time(time_t_start_day,time_duration_type(0,0,0));
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if (t < time_t_start_time) {
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boost::throw_exception(std::out_of_range("Cannot convert dates prior to Jan 1, 1970"));
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BOOST_DATE_TIME_UNREACHABLE_EXPRESSION(return time_t_start_time); // should never reach
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}
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date_duration_type dd = t.date() - time_t_start_day;
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time_duration_type td = t.time_of_day();
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uint64_t t2 = static_cast<uint64_t>(dd.days())*86400 +
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static_cast<uint64_t>(td.hours())*3600 +
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static_cast<uint64_t>(td.minutes())*60 +
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td.seconds();
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// detect y2038 issue and throw instead of proceed with bad time
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std::time_t tv = boost::numeric_cast<std::time_t>(t2);
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std::tm tms, *tms_ptr;
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tms_ptr = c_time::localtime(&tv, &tms);
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date_type d(static_cast<unsigned short>(tms_ptr->tm_year + 1900),
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static_cast<unsigned short>(tms_ptr->tm_mon + 1),
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static_cast<unsigned short>(tms_ptr->tm_mday));
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time_duration_type td2(tms_ptr->tm_hour,
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tms_ptr->tm_min,
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tms_ptr->tm_sec,
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t.time_of_day().fractional_seconds());
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return time_type(d,td2);
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}
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};
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} } //namespace date_time
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#endif
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