1#ifndef POSIX_TIME_CONVERSION_HPP___
2#define POSIX_TIME_CONVERSION_HPP___
3
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
9 * $Date$
10 */
11
12#include <cstring>
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>
20
21namespace boost {
22
23namespace posix_time {
24
25 //! Function that converts a time_t into a ptime.
26 inline
27 ptime from_time_t(std::time_t t)
28 {
29 return ptime(gregorian::date(1970,1,1)) + seconds(static_cast<long>(t));
30 }
31
32 //! Function that converts a ptime into a time_t
33 inline
34 std::time_t to_time_t(ptime pt)
35 {
36 return (pt - ptime(gregorian::date(1970,1,1))).total_seconds();
37 }
38
39 //! Convert a time to a tm structure truncating any fractional seconds
40 inline
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
48 return timetm;
49 }
50 //! Convert a time_duration to a tm structure truncating any fractional seconds and zeroing fields for date components
51 inline
52 std::tm to_tm(const boost::posix_time::time_duration& td) {
53 std::tm timetm;
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
59 return timetm;
60 }
61
62 //! Convert a tm struct to a ptime ignoring is_dst flag
63 inline
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));
67 }
68
69
70#if defined(BOOST_HAS_FTIME)
71
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.
77 *
78 * \note FILETIME is part of the Win32 API, so it is not portable to non-windows
79 * platforms.
80 *
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::date_time::winapi::file_time type.
84 */
85 template< typename TimeT, typename FileTimeT >
86 inline
87 TimeT from_ftime(const FileTimeT& ft)
88 {
89 return boost::date_time::time_from_ftime<TimeT>(ft);
90 }
91
92#endif // BOOST_HAS_FTIME
93
94} } //namespace boost::posix_time
95
96
97
98
99#endif
100
101