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/* $Id: time2-win.cpp $ */
/** @file
* IPRT - Time, Windows.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP RTLOGGROUP_TIME
#include <iprt/win/windows.h>
#include <iprt/time.h>
#include "internal/iprt.h"
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include "internal/time.h"
#include "internal-r3-win.h"
RTDECL(int) RTTimeSet(PCRTTIMESPEC pTime)
{
FILETIME FileTime;
SYSTEMTIME SysTime;
if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTime, &FileTime), &SysTime))
{
if (SetSystemTime(&SysTime))
return VINF_SUCCESS;
}
return RTErrConvertFromWin32(GetLastError());
}
RTDECL(PRTTIME) RTTimeLocalExplode(PRTTIME pTime, PCRTTIMESPEC pTimeSpec)
{
RTTIMESPEC LocalTime;
if (g_pfnSystemTimeToTzSpecificLocalTime)
{
/*
* FileTimeToLocalFileTime does not do the right thing, so we'll have
* to convert to system time and SystemTimeToTzSpecificLocalTime instead.
*
* Note! FileTimeToSystemTime drops resoultion down to milliseconds, thus
* we have to do the offUTC calculation using milliseconds and adjust
* u32Nanosecons by sub milliseconds digits.
*/
SYSTEMTIME SystemTimeIn;
FILETIME FileTime;
if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTimeSpec, &FileTime), &SystemTimeIn))
{
SYSTEMTIME SystemTimeOut;
if (g_pfnSystemTimeToTzSpecificLocalTime(NULL /* use current TZI */, &SystemTimeIn, &SystemTimeOut))
{
if (SystemTimeToFileTime(&SystemTimeOut, &FileTime))
{
RTTimeSpecSetNtFileTime(&LocalTime, &FileTime);
pTime = RTTimeExplode(pTime, &LocalTime);
if (pTime)
{
pTime->fFlags = (pTime->fFlags & ~RTTIME_FLAGS_TYPE_MASK) | RTTIME_FLAGS_TYPE_LOCAL;
pTime->offUTC = (RTTimeSpecGetMilli(&LocalTime) - RTTimeSpecGetMilli(pTimeSpec)) / RT_MS_1MIN;
pTime->u32Nanosecond += RTTimeSpecGetNano(pTimeSpec) % RT_NS_1MS;
}
return pTime;
}
}
}
}
/*
* The fallback is to use the current offset.
* (A better fallback would be to use the offset of the same time of the year.)
*/
LocalTime = *pTimeSpec;
int64_t cNsUtcOffset = RTTimeLocalDeltaNano();
RTTimeSpecAddNano(&LocalTime, cNsUtcOffset);
pTime = RTTimeExplode(pTime, &LocalTime);
if (pTime)
{
pTime->fFlags = (pTime->fFlags & ~RTTIME_FLAGS_TYPE_MASK) | RTTIME_FLAGS_TYPE_LOCAL;
pTime->offUTC = cNsUtcOffset / RT_NS_1MIN;
}
return pTime;
}
/**
* Gets the delta between UTC and local time at the given time.
*
* @code
* RTTIMESPEC LocalTime;
* RTTimeNow(&LocalTime);
* RTTimeSpecAddNano(&LocalTime, RTTimeLocalDeltaNanoFor(&LocalTime));
* @endcode
*
* @param pTimeSpec The time spec giving the time to get the delta for.
* @returns Returns the nanosecond delta between UTC and local time.
*/
RTDECL(int64_t) RTTimeLocalDeltaNanoFor(PCRTTIMESPEC pTimeSpec)
{
RTTIMESPEC LocalTime;
if (g_pfnSystemTimeToTzSpecificLocalTime)
{
/*
* FileTimeToLocalFileTime does not do the right thing, so we'll have
* to convert to system time and SystemTimeToTzSpecificLocalTime instead.
*
* Note! FileTimeToSystemTime drops resoultion down to milliseconds, thus
* we have to do the offUTC calculation using milliseconds and adjust
* u32Nanosecons by sub milliseconds digits.
*/
SYSTEMTIME SystemTimeIn;
FILETIME FileTime;
if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTimeSpec, &FileTime), &SystemTimeIn))
{
SYSTEMTIME SystemTimeOut;
if (g_pfnSystemTimeToTzSpecificLocalTime(NULL /* use current TZI */, &SystemTimeIn, &SystemTimeOut))
{
if (SystemTimeToFileTime(&SystemTimeOut, &FileTime))
{
RTTimeSpecSetNtFileTime(&LocalTime, &FileTime);
return (RTTimeSpecGetMilli(&LocalTime) - RTTimeSpecGetMilli(pTimeSpec)) * RT_NS_1MS;
}
}
}
}
return RTTimeLocalDeltaNano();
}
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