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/date_time/posix_time/ptime.hpp> |
14 | #include <boost/date_time/posix_time/posix_time_duration.hpp> |
15 | #include <boost/date_time/filetime_functions.hpp> |
16 | #include <boost/date_time/c_time.hpp> |
17 | #include <boost/date_time/time_resolution_traits.hpp> // absolute_value |
18 | #include <boost/date_time/gregorian/conversion.hpp> |
19 | |
20 | namespace boost { |
21 | |
22 | namespace posix_time { |
23 | |
24 | |
25 | //! Function that converts a time_t into a ptime. |
26 | inline |
27 | ptime from_time_t(std::time_t t) |
28 | { |
29 | ptime start(gregorian::date(1970,1,1)); |
30 | return start + seconds(static_cast<long>(t)); |
31 | } |
32 | |
33 | //! Function that converts a ptime into a time_t |
34 | inline |
35 | std::time_t to_time_t(ptime pt) |
36 | { |
37 | time_duration dur = pt - ptime(gregorian::date(1970,1,1)); |
38 | return std::time_t(dur.total_seconds()); |
39 | } |
40 | |
41 | //! Convert a time to a tm structure truncating any fractional seconds |
42 | inline |
43 | std::tm to_tm(const boost::posix_time::ptime& t) { |
44 | std::tm timetm = boost::gregorian::to_tm(d: t.date()); |
45 | boost::posix_time::time_duration td = t.time_of_day(); |
46 | timetm.tm_hour = td.hours(); |
47 | timetm.tm_min = td.minutes(); |
48 | timetm.tm_sec = td.seconds(); |
49 | timetm.tm_isdst = -1; // -1 used when dst info is unknown |
50 | return timetm; |
51 | } |
52 | //! Convert a time_duration to a tm structure truncating any fractional seconds and zeroing fields for date components |
53 | inline |
54 | std::tm to_tm(const boost::posix_time::time_duration& td) { |
55 | std::tm timetm; |
56 | std::memset(s: &timetm, c: 0, n: sizeof(timetm)); |
57 | timetm.tm_hour = date_time::absolute_value(x: td.hours()); |
58 | timetm.tm_min = date_time::absolute_value(x: td.minutes()); |
59 | timetm.tm_sec = date_time::absolute_value(x: td.seconds()); |
60 | timetm.tm_isdst = -1; // -1 used when dst info is unknown |
61 | return timetm; |
62 | } |
63 | |
64 | //! Convert a tm struct to a ptime ignoring is_dst flag |
65 | inline |
66 | ptime ptime_from_tm(const std::tm& timetm) { |
67 | boost::gregorian::date d = boost::gregorian::date_from_tm(datetm: timetm); |
68 | return ptime(d, time_duration(timetm.tm_hour, timetm.tm_min, timetm.tm_sec)); |
69 | } |
70 | |
71 | |
72 | #if defined(BOOST_HAS_FTIME) |
73 | |
74 | //! Function to create a time object from an initialized FILETIME struct. |
75 | /*! Function to create a time object from an initialized FILETIME struct. |
76 | * A FILETIME struct holds 100-nanosecond units (0.0000001). When |
77 | * built with microsecond resolution the FILETIME's sub second value |
78 | * will be truncated. Nanosecond resolution has no truncation. |
79 | * |
80 | * \note FILETIME is part of the Win32 API, so it is not portable to non-windows |
81 | * platforms. |
82 | * |
83 | * \note The function is templated on the FILETIME type, so that |
84 | * it can be used with both native FILETIME and the ad-hoc |
85 | * boost::date_time::winapi::file_time type. |
86 | */ |
87 | template< typename TimeT, typename FileTimeT > |
88 | inline |
89 | TimeT from_ftime(const FileTimeT& ft) |
90 | { |
91 | return boost::date_time::time_from_ftime<TimeT>(ft); |
92 | } |
93 | |
94 | #endif // BOOST_HAS_FTIME |
95 | |
96 | } } //namespace boost::posix_time |
97 | |
98 | |
99 | |
100 | |
101 | #endif |
102 | |
103 | |