95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
#ifndef POSIX_TIME_CONVERSION_HPP___
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#define POSIX_TIME_CONVERSION_HPP___
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/* Copyright (c) 2002-2005 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 11:10:13 -0700 (Wed, 09 Jun 2010) $
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*/
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#include <cstring>
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#include <boost/date_time/posix_time/ptime.hpp>
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#include <boost/date_time/posix_time/posix_time_duration.hpp>
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#include <boost/date_time/filetime_functions.hpp>
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#include <boost/date_time/c_time.hpp>
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#include <boost/date_time/time_resolution_traits.hpp> // absolute_value
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#include <boost/date_time/gregorian/conversion.hpp>
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namespace boost {
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namespace posix_time {
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//! Function that converts a time_t into a ptime.
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inline
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ptime from_time_t(std::time_t t)
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{
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ptime start(gregorian::date(1970,1,1));
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return start + seconds(static_cast<long>(t));
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}
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//! Convert a time to a tm structure truncating any fractional seconds
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inline
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std::tm to_tm(const boost::posix_time::ptime& t) {
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std::tm timetm = boost::gregorian::to_tm(t.date());
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boost::posix_time::time_duration td = t.time_of_day();
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timetm.tm_hour = td.hours();
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timetm.tm_min = td.minutes();
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timetm.tm_sec = td.seconds();
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timetm.tm_isdst = -1; // -1 used when dst info is unknown
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return timetm;
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}
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//! Convert a time_duration to a tm structure truncating any fractional seconds and zeroing fields for date components
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inline
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std::tm to_tm(const boost::posix_time::time_duration& td) {
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std::tm timetm;
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std::memset(&timetm, 0, sizeof(timetm));
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timetm.tm_hour = date_time::absolute_value(td.hours());
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timetm.tm_min = date_time::absolute_value(td.minutes());
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timetm.tm_sec = date_time::absolute_value(td.seconds());
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timetm.tm_isdst = -1; // -1 used when dst info is unknown
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return timetm;
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}
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//! Convert a tm struct to a ptime ignoring is_dst flag
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inline
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ptime ptime_from_tm(const std::tm& timetm) {
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boost::gregorian::date d = boost::gregorian::date_from_tm(timetm);
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return ptime(d, time_duration(timetm.tm_hour, timetm.tm_min, timetm.tm_sec));
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}
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#if defined(BOOST_HAS_FTIME)
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//! Function to create a time object from an initialized FILETIME struct.
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/*! Function to create a time object from an initialized FILETIME struct.
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* A FILETIME struct holds 100-nanosecond units (0.0000001). When
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* built with microsecond resolution the FILETIME's sub second value
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* will be truncated. Nanosecond resolution has no truncation.
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*
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* \note FILETIME is part of the Win32 API, so it is not portable to non-windows
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* platforms.
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*
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* \note The function is templated on the FILETIME type, so that
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* it can be used with both native FILETIME and the ad-hoc
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* boost::date_time::winapi::file_time type.
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*/
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template< typename TimeT, typename FileTimeT >
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inline
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TimeT from_ftime(const FileTimeT& ft)
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{
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return boost::date_time::time_from_ftime<TimeT>(ft);
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}
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#endif // BOOST_HAS_FTIME
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} } //namespace boost::posix_time
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#endif
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