VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/win/time2-win.cpp@ 103795

Last change on this file since 103795 was 98103, checked in by vboxsync, 23 months ago

Copyright year updates by scm.

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  • Property svn:keywords set to Id Revision
File size: 5.9 KB
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1/* $Id: time2-win.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2/** @file
3 * IPRT - Time, Windows.
4 */
5
6/*
7 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#define LOG_GROUP RTLOGGROUP_TIME
42#include <iprt/win/windows.h>
43
44#include <iprt/time.h>
45#include "internal/iprt.h"
46
47#include <iprt/assert.h>
48#include <iprt/errcore.h>
49#include "internal/time.h"
50
51#include "internal-r3-win.h"
52
53
54RTDECL(int) RTTimeSet(PCRTTIMESPEC pTime)
55{
56 FILETIME FileTime;
57 SYSTEMTIME SysTime;
58 if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTime, &FileTime), &SysTime))
59 {
60 if (SetSystemTime(&SysTime))
61 return VINF_SUCCESS;
62 }
63 return RTErrConvertFromWin32(GetLastError());
64}
65
66
67RTDECL(PRTTIME) RTTimeLocalExplode(PRTTIME pTime, PCRTTIMESPEC pTimeSpec)
68{
69 RTTIMESPEC LocalTime;
70 if (g_pfnSystemTimeToTzSpecificLocalTime)
71 {
72 /*
73 * FileTimeToLocalFileTime does not do the right thing, so we'll have
74 * to convert to system time and SystemTimeToTzSpecificLocalTime instead.
75 *
76 * Note! FileTimeToSystemTime drops resoultion down to milliseconds, thus
77 * we have to do the offUTC calculation using milliseconds and adjust
78 * u32Nanosecons by sub milliseconds digits.
79 */
80 SYSTEMTIME SystemTimeIn;
81 FILETIME FileTime;
82 if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTimeSpec, &FileTime), &SystemTimeIn))
83 {
84 SYSTEMTIME SystemTimeOut;
85 if (g_pfnSystemTimeToTzSpecificLocalTime(NULL /* use current TZI */, &SystemTimeIn, &SystemTimeOut))
86 {
87 if (SystemTimeToFileTime(&SystemTimeOut, &FileTime))
88 {
89 RTTimeSpecSetNtFileTime(&LocalTime, &FileTime);
90 pTime = RTTimeExplode(pTime, &LocalTime);
91 if (pTime)
92 {
93 pTime->fFlags = (pTime->fFlags & ~RTTIME_FLAGS_TYPE_MASK) | RTTIME_FLAGS_TYPE_LOCAL;
94 pTime->offUTC = (RTTimeSpecGetMilli(&LocalTime) - RTTimeSpecGetMilli(pTimeSpec)) / RT_MS_1MIN;
95 pTime->u32Nanosecond += RTTimeSpecGetNano(pTimeSpec) % RT_NS_1MS;
96 }
97 return pTime;
98 }
99 }
100 }
101 }
102
103 /*
104 * The fallback is to use the current offset.
105 * (A better fallback would be to use the offset of the same time of the year.)
106 */
107 LocalTime = *pTimeSpec;
108 int64_t cNsUtcOffset = RTTimeLocalDeltaNano();
109 RTTimeSpecAddNano(&LocalTime, cNsUtcOffset);
110 pTime = RTTimeExplode(pTime, &LocalTime);
111 if (pTime)
112 {
113 pTime->fFlags = (pTime->fFlags & ~RTTIME_FLAGS_TYPE_MASK) | RTTIME_FLAGS_TYPE_LOCAL;
114 pTime->offUTC = cNsUtcOffset / RT_NS_1MIN;
115 }
116 return pTime;
117}
118
119
120/**
121 * Gets the delta between UTC and local time at the given time.
122 *
123 * @code
124 * RTTIMESPEC LocalTime;
125 * RTTimeNow(&LocalTime);
126 * RTTimeSpecAddNano(&LocalTime, RTTimeLocalDeltaNanoFor(&LocalTime));
127 * @endcode
128 *
129 * @param pTimeSpec The time spec giving the time to get the delta for.
130 * @returns Returns the nanosecond delta between UTC and local time.
131 */
132RTDECL(int64_t) RTTimeLocalDeltaNanoFor(PCRTTIMESPEC pTimeSpec)
133{
134 RTTIMESPEC LocalTime;
135 if (g_pfnSystemTimeToTzSpecificLocalTime)
136 {
137 /*
138 * FileTimeToLocalFileTime does not do the right thing, so we'll have
139 * to convert to system time and SystemTimeToTzSpecificLocalTime instead.
140 *
141 * Note! FileTimeToSystemTime drops resoultion down to milliseconds, thus
142 * we have to do the offUTC calculation using milliseconds and adjust
143 * u32Nanosecons by sub milliseconds digits.
144 */
145 SYSTEMTIME SystemTimeIn;
146 FILETIME FileTime;
147 if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTimeSpec, &FileTime), &SystemTimeIn))
148 {
149 SYSTEMTIME SystemTimeOut;
150 if (g_pfnSystemTimeToTzSpecificLocalTime(NULL /* use current TZI */, &SystemTimeIn, &SystemTimeOut))
151 {
152 if (SystemTimeToFileTime(&SystemTimeOut, &FileTime))
153 {
154 RTTimeSpecSetNtFileTime(&LocalTime, &FileTime);
155
156 return (RTTimeSpecGetMilli(&LocalTime) - RTTimeSpecGetMilli(pTimeSpec)) * RT_NS_1MS;
157 }
158 }
159 }
160 }
161
162 return RTTimeLocalDeltaNano();
163}
164
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