1 #ifndef POSIX_TIME_CONVERSION_HPP___
2 #define POSIX_TIME_CONVERSION_HPP___
4 /* Copyright (c) 2002-2005 CrystalClear Software, Inc.
5 * Use, modification and distribution is subject to the
6 * Boost Software License, Version 1.0. (See accompanying
7 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
8 * Author: Jeff Garland, Bart Garst
13 #include <boost/cstdint.hpp>
14 #include <boost/date_time/posix_time/ptime.hpp>
15 #include <boost/date_time/posix_time/posix_time_duration.hpp>
16 #include <boost/date_time/filetime_functions.hpp>
17 #include <boost/date_time/c_time.hpp>
18 #include <boost/date_time/time_resolution_traits.hpp> // absolute_value
19 #include <boost/date_time/gregorian/conversion.hpp>
23 namespace posix_time {
25 //! Function that converts a time_t into a ptime.
27 ptime from_time_t(std::time_t t)
29 return ptime(gregorian::date(1970,1,1)) + seconds(static_cast<long>(t));
32 //! Function that converts a ptime into a time_t
34 std::time_t to_time_t(ptime pt)
36 return (pt - ptime(gregorian::date(1970,1,1))).total_seconds();
39 //! Convert a time to a tm structure truncating any fractional seconds
41 std::tm to_tm(const boost::posix_time::ptime& t) {
42 std::tm timetm = boost::gregorian::to_tm(t.date());
43 boost::posix_time::time_duration td = t.time_of_day();
44 timetm.tm_hour = static_cast<int>(td.hours());
45 timetm.tm_min = static_cast<int>(td.minutes());
46 timetm.tm_sec = static_cast<int>(td.seconds());
47 timetm.tm_isdst = -1; // -1 used when dst info is unknown
50 //! Convert a time_duration to a tm structure truncating any fractional seconds and zeroing fields for date components
52 std::tm to_tm(const boost::posix_time::time_duration& td) {
54 std::memset(&timetm, 0, sizeof(timetm));
55 timetm.tm_hour = static_cast<int>(date_time::absolute_value(td.hours()));
56 timetm.tm_min = static_cast<int>(date_time::absolute_value(td.minutes()));
57 timetm.tm_sec = static_cast<int>(date_time::absolute_value(td.seconds()));
58 timetm.tm_isdst = -1; // -1 used when dst info is unknown
62 //! Convert a tm struct to a ptime ignoring is_dst flag
64 ptime ptime_from_tm(const std::tm& timetm) {
65 boost::gregorian::date d = boost::gregorian::date_from_tm(timetm);
66 return ptime(d, time_duration(timetm.tm_hour, timetm.tm_min, timetm.tm_sec));
70 #if defined(BOOST_HAS_FTIME)
72 //! Function to create a time object from an initialized FILETIME struct.
73 /*! Function to create a time object from an initialized FILETIME struct.
74 * A FILETIME struct holds 100-nanosecond units (0.0000001). When
75 * built with microsecond resolution the FILETIME's sub second value
76 * will be truncated. Nanosecond resolution has no truncation.
78 * \note FILETIME is part of the Win32 API, so it is not portable to non-windows
81 * \note The function is templated on the FILETIME type, so that
82 * it can be used with both native FILETIME and the ad-hoc
83 * boost::detail::winapi::FILETIME_ type.
85 template< typename TimeT, typename FileTimeT >
87 TimeT from_ftime(const FileTimeT& ft)
89 return boost::date_time::time_from_ftime<TimeT>(ft);
92 #endif // BOOST_HAS_FTIME
94 } } //namespace boost::posix_time