Simplify date conversion functions

Do not use the 3rd-party code from JSC, but instead use the QDateTime
functions for millisecond offsets from the epoch.

Note that this change is reviving the earlier change:
http://codereview.qt-project.org/1874.  The test failures for that
change no longer occur due to a change in the QDateTime behavior
applied by: http://codereview.qt-project.org/13169

There is still a semantic difference between QDateTime and the
ECMAScript specification with regards to the application of DST.
ECMAScript requires that the current DST adjustment should be applied
to historical dates, whereas QDateTime will apply the adjustment as
applicable at the epoch date to any prior dates.

Change-Id: Ibebd47c9d2b75a034342ffcda075501a6a527b8d
Reviewed-by: Chris Adams <christopher.adams@nokia.com>

6 files changed, 11 insertions, 1124 deletions

diff --git a/src/3rdparty/javascriptcore/COPYING.LIB b/src/3rdparty/javascriptcore/COPYING.LIB
deleted file mode 100644
index 87c4a33dd8..0000000000
--- a/src/3rdparty/javascriptcore/COPYING.LIB
+++ /dev/null
@@ -1,488 +0,0 @@
-
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-NOTE! The LGPL below is copyrighted by the Free Software Foundation, but 
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diff --git a/src/3rdparty/javascriptcore/DateMath.cpp b/src/3rdparty/javascriptcore/DateMath.cpp
deleted file mode 100644
index be99d2ca25..0000000000
--- a/src/3rdparty/javascriptcore/DateMath.cpp
+++ /dev/null
@@ -1,393 +0,0 @@
-/*
- * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
- * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
- * Copyright (C) 2009 Google Inc. All rights reserved.
- * Copyright (C) 2007-2009 Torch Mobile, Inc.
- *
- * The Original Code is Mozilla Communicator client code, released
- * March 31, 1998.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
- *
- * Alternatively, the contents of this file may be used under the terms
- * of either the Mozilla Public License Version 1.1, found at
- * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
- * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
- * (the "GPL"), in which case the provisions of the MPL or the GPL are
- * applicable instead of those above.  If you wish to allow use of your
- * version of this file only under the terms of one of those two
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- * version of this file under the LGPL, indicate your decision by
- * deletingthe provisions above and replace them with the notice and
- * other provisions required by the MPL or the GPL, as the case may be.
- * If you do not delete the provisions above, a recipient may use your
- * version of this file under any of the LGPL, the MPL or the GPL.
-
- * Copyright 2006-2008 the V8 project authors. All rights reserved.
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- *       notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- *       copyright notice, this list of conditions and the following
- *       disclaimer in the documentation and/or other materials provided
- *       with the distribution.
- *     * Neither the name of Google Inc. nor the names of its
- *       contributors may be used to endorse or promote products derived
- *       from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "DateMath.h"
-
-#include <algorithm>
-#include <limits.h>
-#include <limits>
-#include <time.h>
-#include <cmath>
-
-//#if HAVE(SYS_TIME_H)
-#if defined(EXISTS_SYS_TIME)
-#include <sys/time.h>
-#endif
-
-//#if HAVE(SYS_TIMEB_H)
-#if defined(EXISTS_SYS_TIMEB)
-#include <sys/timeb.h>
-#endif
-
-#define NaN std::numeric_limits<double>::quiet_NaN()
-
-using namespace QV8DateConverter::WTF;
-
-namespace QV8DateConverter {
-
-namespace WTF {
-
-/* Constants */
-
-static const double minutesPerDay = 24.0 * 60.0;
-static const double secondsPerDay = 24.0 * 60.0 * 60.0;
-static const double secondsPerYear = 24.0 * 60.0 * 60.0 * 365.0;
-
-static const double usecPerSec = 1000000.0;
-
-static const double maxUnixTime = 2145859200.0; // 12/31/2037
-// ECMAScript asks not to support for a date of which total
-// millisecond value is larger than the following value.
-// See 15.9.1.14 of ECMA-262 5th edition.
-static const double maxECMAScriptTime = 8.64E15;
-
-// Day of year for the first day of each month, where index 0 is January, and day 0 is January 1.
-// First for non-leap years, then for leap years.
-static const int firstDayOfMonth[2][12] = {
-    {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334},
-    {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335}
-};
-
-static inline bool isLeapYear(int year)
-{
-    if (year % 4 != 0)
-        return false;
-    if (year % 400 == 0)
-        return true;
-    if (year % 100 == 0)
-        return false;
-    return true;
-}
-
-static inline int daysInYear(int year)
-{
-    return 365 + isLeapYear(year);
-}
-
-static inline double daysFrom1970ToYear(int year)
-{
-    // The Gregorian Calendar rules for leap years:
-    // Every fourth year is a leap year.  2004, 2008, and 2012 are leap years.
-    // However, every hundredth year is not a leap year.  1900 and 2100 are not leap years.
-    // Every four hundred years, there's a leap year after all.  2000 and 2400 are leap years.
-
-    static const int leapDaysBefore1971By4Rule = 1970 / 4;
-    static const int excludedLeapDaysBefore1971By100Rule = 1970 / 100;
-    static const int leapDaysBefore1971By400Rule = 1970 / 400;
-
-    const double yearMinusOne = year - 1;
-    const double yearsToAddBy4Rule = floor(yearMinusOne / 4.0) - leapDaysBefore1971By4Rule;
-    const double yearsToExcludeBy100Rule = floor(yearMinusOne / 100.0) - excludedLeapDaysBefore1971By100Rule;
-    const double yearsToAddBy400Rule = floor(yearMinusOne / 400.0) - leapDaysBefore1971By400Rule;
-
-    return 365.0 * (year - 1970) + yearsToAddBy4Rule - yearsToExcludeBy100Rule + yearsToAddBy400Rule;
-}
-
-static inline double msToDays(double ms)
-{
-    return floor(ms / msPerDay);
-}
-
-int msToYear(double ms)
-{
-    int approxYear = static_cast<int>(floor(ms / (msPerDay * 365.2425)) + 1970);
-    double msFromApproxYearTo1970 = msPerDay * daysFrom1970ToYear(approxYear);
-    if (msFromApproxYearTo1970 > ms)
-        return approxYear - 1;
-    if (msFromApproxYearTo1970 + msPerDay * daysInYear(approxYear) <= ms)
-        return approxYear + 1;
-    return approxYear;
-}
-
-int dayInYear(double ms, int year)
-{
-    return static_cast<int>(msToDays(ms) - daysFrom1970ToYear(year));
-}
-
-static inline double msToMilliseconds(double ms)
-{
-    double result = fmod(ms, msPerDay);
-    if (result < 0)
-        result += msPerDay;
-    return result;
-}
-
-// 0: Sunday, 1: Monday, etc.
-static inline int msToWeekDay(double ms)
-{
-    int wd = (static_cast<int>(msToDays(ms)) + 4) % 7;
-    if (wd < 0)
-        wd += 7;
-    return wd;
-}
-
-static inline int msToSeconds(double ms)
-{
-    double result = fmod(floor(ms / msPerSecond), secondsPerMinute);
-    if (result < 0)
-        result += secondsPerMinute;
-    return static_cast<int>(result);
-}
-
-static inline int msToMinutes(double ms)
-{
-    double result = fmod(floor(ms / msPerMinute), minutesPerHour);
-    if (result < 0)
-        result += minutesPerHour;
-    return static_cast<int>(result);
-}
-
-static inline int msToHours(double ms)
-{
-    double result = fmod(floor(ms/msPerHour), hoursPerDay);
-    if (result < 0)
-        result += hoursPerDay;
-    return static_cast<int>(result);
-}
-
-int monthFromDayInYear(int dayInYear, bool leapYear)
-{
-    const int d = dayInYear;
-    int step;
-
-    if (d < (step = 31))
-        return 0;
-    step += (leapYear ? 29 : 28);
-    if (d < step)
-        return 1;
-    if (d < (step += 31))
-        return 2;
-    if (d < (step += 30))
-        return 3;
-    if (d < (step += 31))
-        return 4;
-    if (d < (step += 30))
-        return 5;
-    if (d < (step += 31))
-        return 6;
-    if (d < (step += 31))
-        return 7;
-    if (d < (step += 30))
-        return 8;
-    if (d < (step += 31))
-        return 9;
-    if (d < (step += 30))
-        return 10;
-    return 11;
-}
-
-static inline bool checkMonth(int dayInYear, int& startDayOfThisMonth, int& startDayOfNextMonth, int daysInThisMonth)
-{
-    startDayOfThisMonth = startDayOfNextMonth;
-    startDayOfNextMonth += daysInThisMonth;
-    return (dayInYear <= startDayOfNextMonth);
-}
-
-int dayInMonthFromDayInYear(int dayInYear, bool leapYear)
-{
-    const int d = dayInYear;
-    int step;
-    int next = 30;
-
-    if (d <= next)
-        return d + 1;
-    const int daysInFeb = (leapYear ? 29 : 28);
-    if (checkMonth(d, step, next, daysInFeb))
-        return d - step;
-    if (checkMonth(d, step, next, 31))
-        return d - step;
-    if (checkMonth(d, step, next, 30))
-        return d - step;
-    if (checkMonth(d, step, next, 31))
-        return d - step;
-    if (checkMonth(d, step, next, 30))
-        return d - step;
-    if (checkMonth(d, step, next, 31))
-        return d - step;
-    if (checkMonth(d, step, next, 31))
-        return d - step;
-    if (checkMonth(d, step, next, 30))
-        return d - step;
-    if (checkMonth(d, step, next, 31))
-        return d - step;
-    if (checkMonth(d, step, next, 30))
-        return d - step;
-    step = next;
-    return d - step;
-}
-
-static inline int monthToDayInYear(int month, bool isLeapYear)
-{
-    return firstDayOfMonth[isLeapYear][month];
-}
-
-static inline double timeToMS(double hour, double min, double sec, double ms)
-{
-    return (((hour * minutesPerHour + min) * secondsPerMinute + sec) * msPerSecond + ms);
-}
-
-double dateToDaysFrom1970(int year, int month, int day)
-{
-    year += month / 12;
-
-    month %= 12;
-    if (month < 0) {
-        month += 12;
-        --year;
-    }
-
-    double yearday = floor(daysFrom1970ToYear(year));
-    int monthday = monthToDayInYear(month, isLeapYear(year));
-
-    return yearday + monthday + day - 1;
-}
-
-static inline double ymdhmsToSeconds(long year, int mon, int day, int hour, int minute, int second)
-{
-    double days = (day - 32075)
-        + floor(1461 * (year + 4800.0 + (mon - 14) / 12) / 4)
-        + 367 * (mon - 2 - (mon - 14) / 12 * 12) / 12
-        - floor(3 * ((year + 4900.0 + (mon - 14) / 12) / 100) / 4)
-        - 2440588;
-    return ((days * hoursPerDay + hour) * minutesPerHour + minute) * secondsPerMinute + second;
-}
-
-// We follow the recommendation of RFC 2822 to consider all
-// obsolete time zones not listed here equivalent to "-0000".
-static const struct KnownZone {
-    const
-        char tzName[4];
-    int tzOffset;
-} known_zones[] = {
-    { "UT", 0 },
-    { "GMT", 0 },
-    { "EST", -300 },
-    { "EDT", -240 },
-    { "CST", -360 },
-    { "CDT", -300 },
-    { "MST", -420 },
-    { "MDT", -360 },
-    { "PST", -480 },
-    { "PDT", -420 }
-};
-
-double timeClip(double t)
-{
-#if defined(_MSC_VER)
-    if (!_finite(t)  || fabs(t) > maxECMAScriptTime)
-        return  NaN;
-    return t >= 0 ? floor(t) : ceil(t);
-#else
-
-#if defined(__QNXNTO__)
-    if (!isfinite(t) || fabs(t) > maxECMAScriptTime)
-        return NaN;
-#else
-    if (!std::isfinite(t) || fabs(t) > maxECMAScriptTime)
-        return NaN;
-#endif
-
-    return trunc(t);
-#endif
-}
-} // namespace WTF
-
-namespace JSC {
-
-double gregorianDateTimeToMS(const GregorianDateTime& t, double milliSeconds)
-{
-    double day = dateToDaysFrom1970(t.year + 1900, t.month, t.monthDay);
-    double ms = timeToMS(t.hour, t.minute, t.second, milliSeconds);
-    double result = (day * WTF::msPerDay) + ms;
-
-    return result;
-}
-
-// input is UTC
-void msToGregorianDateTime(double ms, GregorianDateTime& tm)
-{
-    const int year = msToYear(ms);
-    tm.second   =  msToSeconds(ms);
-    tm.minute   =  msToMinutes(ms);
-    tm.hour     =  msToHours(ms);
-    tm.weekDay  =  msToWeekDay(ms);
-    tm.yearDay  =  dayInYear(ms, year);
-    tm.monthDay =  dayInMonthFromDayInYear(tm.yearDay, isLeapYear(year));
-    tm.month    =  monthFromDayInYear(tm.yearDay, isLeapYear(year));
-    tm.year     =  year - 1900;
-    tm.isDST    =  false;
-    tm.utcOffset = static_cast<long>(0); // no ExecState :. cannot calculate offset.  Assume UTC output.
-    tm.timeZone = NULL;
-}
-
-} // namespace JSC
-
-} // namespace QV8DateConverter
-
diff --git a/src/3rdparty/javascriptcore/DateMath.h b/src/3rdparty/javascriptcore/DateMath.h
deleted file mode 100644
index 5adb0d358c..0000000000
--- a/src/3rdparty/javascriptcore/DateMath.h
+++ /dev/null
@@ -1,190 +0,0 @@
-/*
- * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
- * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
- * Copyright (C) 2009 Google Inc. All rights reserved.
- *
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla Communicator client code, released
- * March 31, 1998.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of the GNU General Public License Version 2 or later (the "GPL"),
- * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- */
-
-#ifndef DateMath_h
-#define DateMath_h
-
-#include <math.h>
-#include <string.h>
-#include <time.h>
-
-namespace QV8DateConverter {
-
-namespace WTF {
-
-double timeClip(double);
-
-const char * const weekdayName[7] = { "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" };
-const char * const monthName[12] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
-
-const double hoursPerDay = 24.0;
-const double minutesPerHour = 60.0;
-const double secondsPerHour = 60.0 * 60.0;
-const double secondsPerMinute = 60.0;
-const double msPerSecond = 1000.0;
-const double msPerMinute = 60.0 * 1000.0;
-const double msPerHour = 60.0 * 60.0 * 1000.0;
-const double msPerDay = 24.0 * 60.0 * 60.0 * 1000.0;
-const double msPerMonth = 2592000000.0;
-
-// Returns the number of days from 1970-01-01 to the specified date.
-double dateToDaysFrom1970(int year, int month, int day);
-int msToYear(double ms);
-int dayInYear(double ms, int year);
-int monthFromDayInYear(int dayInYear, bool leapYear);
-int dayInMonthFromDayInYear(int dayInYear, bool leapYear);
-
-} // namespace WTF
-
-using WTF::dateToDaysFrom1970;
-using WTF::dayInMonthFromDayInYear;
-using WTF::dayInYear;
-using WTF::minutesPerHour;
-using WTF::monthFromDayInYear;
-using WTF::msPerDay;
-using WTF::msPerSecond;
-using WTF::msToYear;
-using WTF::secondsPerMinute;
-
-namespace JSC {
-struct GregorianDateTime;
-
-void msToGregorianDateTime(double, GregorianDateTime&);
-double gregorianDateTimeToMS(const GregorianDateTime&, double);
-
-// Intentionally overridding the default tm of the system.
-// The members of tm differ on various operating systems.
-struct GregorianDateTime {
-    GregorianDateTime()
-        : second(0)
-        , minute(0)
-        , hour(0)
-        , weekDay(0)
-        , monthDay(0)
-        , yearDay(0)
-        , month(0)
-        , year(0)
-        , isDST(0)
-        , utcOffset(0)
-        , timeZone(0)
-    {
-    }
-
-    ~GregorianDateTime()
-    {
-        delete [] timeZone;
-    }
-
-    GregorianDateTime(const tm& inTm)
-        : second(inTm.tm_sec)
-        , minute(inTm.tm_min)
-        , hour(inTm.tm_hour)
-        , weekDay(inTm.tm_wday)
-        , monthDay(inTm.tm_mday)
-        , yearDay(inTm.tm_yday)
-        , month(inTm.tm_mon)
-        , year(inTm.tm_year)
-        , isDST(inTm.tm_isdst)
-    {
-        utcOffset = static_cast<int>(0);
-        timeZone = 0;
-    }
-
-    operator tm() const
-    {
-        tm ret;
-        memset(&ret, 0, sizeof(ret));
-
-        ret.tm_sec   =  second;
-        ret.tm_min   =  minute;
-        ret.tm_hour  =  hour;
-        ret.tm_wday  =  weekDay;
-        ret.tm_mday  =  monthDay;
-        ret.tm_yday  =  yearDay;
-        ret.tm_mon   =  month;
-        ret.tm_year  =  year;
-        ret.tm_isdst =  isDST;
-        return ret;
-    }
-
-    void copyFrom(const GregorianDateTime& rhs)
-    {
-        second = rhs.second;
-        minute = rhs.minute;
-        hour = rhs.hour;
-        weekDay = rhs.weekDay;
-        monthDay = rhs.monthDay;
-        yearDay = rhs.yearDay;
-        month = rhs.month;
-        year = rhs.year;
-        isDST = rhs.isDST;
-        utcOffset = rhs.utcOffset;
-        if (rhs.timeZone) {
-            int inZoneSize = strlen(rhs.timeZone) + 1;
-            timeZone = new char[inZoneSize];
-            strncpy(timeZone, rhs.timeZone, inZoneSize);
-        } else
-            timeZone = 0;
-    }
-
-    int second;
-    int minute;
-    int hour;
-    int weekDay;
-    int monthDay;
-    int yearDay;
-    int month;
-    int year;
-    int isDST;
-    int utcOffset;
-    char* timeZone;
-};
-
-static inline int gmtoffset(const GregorianDateTime& t)
-{
-    return t.utcOffset;
-}
-
-} // namespace JSC
-
-} // namespace QV8DateConverter
-
-#endif // DateMath_h
diff --git a/src/3rdparty/javascriptcore/VERSION b/src/3rdparty/javascriptcore/VERSION
deleted file mode 100644
index af6229afcb..0000000000
--- a/src/3rdparty/javascriptcore/VERSION
+++ /dev/null
@@ -1,15 +0,0 @@
-This is a snapshot of the files: DateMath.h and DateMath.cpp
-from a snapshot of JavaScriptCore from
-
-        git://gitorious.org/qtwebkit/qtwebkit.git
-
-The commit imported was from the
-
-        javascriptcore-snapshot-27012011 branch/tag
-
-and has the sha1 checksum
-
-        3ab0f621048fbeb480b687a28ed31d92d8506150
-
-The two files were then modified slightly so that unneeded
-functionality was removed (mostly regarding timezone offset).
diff --git a/src/qml/qml/v8/qv8engine.cpp b/src/qml/qml/v8/qv8engine.cpp
index 4a340e2498..6b034c0ff6 100644
--- a/src/qml/qml/v8/qv8engine.cpp
+++ b/src/qml/qml/v8/qv8engine.cpp
@@ -48,7 +48,6 @@
 #include "qv8sequencewrapper_p.h"
 #include "qv8include_p.h"
 #include "qjsengine_p.h"
-#include "../../../3rdparty/javascriptcore/DateMath.h"
 
 #include <private/qqmlbuiltinfunctions_p.h>
 #include <private/qqmllist_p.h>
@@ -763,23 +762,19 @@ void QV8Engine::setExtensionData(int index, Deletable *data)
 
 double QV8Engine::qtDateTimeToJsDate(const QDateTime &dt)
 {
-    // from QScriptEngine::DateTimeToMs()
     if (!dt.isValid()) {
         return qSNaN();
     }
-    QDateTime utc = dt.toUTC();
-    QDate date = utc.date();
-    QTime time = utc.time();
-    QV8DateConverter::JSC::GregorianDateTime tm;
-    tm.year = date.year() - 1900;
-    tm.month = date.month() - 1;
-    tm.monthDay = date.day();
-    tm.weekDay = date.dayOfWeek();
-    tm.yearDay = date.dayOfYear();
-    tm.hour = time.hour();
-    tm.minute = time.minute();
-    tm.second = time.second();
-    return QV8DateConverter::JSC::gregorianDateTimeToMS(tm, time.msec());
+
+    return dt.toMSecsSinceEpoch();
+}
+
+QDateTime QV8Engine::qtDateTimeFromJsDate(double jsDate)
+{
+    if (qIsNaN(jsDate))
+        return QDateTime();
+
+    return QDateTime::fromMSecsSinceEpoch(jsDate);
 }
 
 v8::Persistent<v8::Object> *QV8Engine::findOwnerAndStrength(QObject *object, bool *shouldBeStrong)
@@ -813,24 +808,6 @@ v8::Persistent<v8::Object> *QV8Engine::findOwnerAndStrength(QObject *object, boo
     }
 }
 
-QDateTime QV8Engine::qtDateTimeFromJsDate(double jsDate)
-{
-    // from QScriptEngine::MsToDateTime()
-    if (qIsNaN(jsDate))
-        return QDateTime();
-    QV8DateConverter::JSC::GregorianDateTime tm;
-    QV8DateConverter::JSC::msToGregorianDateTime(jsDate, tm);
-
-    // from QScriptEngine::MsFromTime()
-    int ms = int(::fmod(jsDate, 1000.0));
-    if (ms < 0)
-        ms += int(1000.0);
-
-    QDateTime convertedUTC = QDateTime(QDate(tm.year + 1900, tm.month + 1, tm.monthDay),
-                                       QTime(tm.hour, tm.minute, tm.second, ms), Qt::UTC);
-    return convertedUTC.toLocalTime();
-}
-
 void QV8Engine::addRelationshipForGC(QObject *object, v8::Persistent<v8::Value> handle)
 {
     if (handle.IsEmpty())
diff --git a/src/qml/qml/v8/v8.pri b/src/qml/qml/v8/v8.pri
index de492a8ce5..7816c84b79 100644
--- a/src/qml/qml/v8/v8.pri
+++ b/src/qml/qml/v8/v8.pri
@@ -1,5 +1,3 @@
-INCLUDEPATH += $$PWD/../../../3rdparty/javascriptcore
-
 include(script.pri)
 
 HEADERS += \
@@ -20,7 +18,6 @@ HEADERS += \
     $$PWD/qv8include_p.h \
     $$PWD/qv8worker_p.h \
     $$PWD/qv8bindings_p.h \
-    $$PWD/../../../3rdparty/javascriptcore/DateMath.h \
     $$PWD/qv8engine_impl_p.h \
     $$PWD/qv8domerrors_p.h \
     $$PWD/qv8sqlerrors_p.h \
@@ -39,7 +36,6 @@ SOURCES += \
     $$PWD/qv8include.cpp \
     $$PWD/qv8worker.cpp \
     $$PWD/qv8bindings.cpp \
-    $$PWD/../../../3rdparty/javascriptcore/DateMath.cpp \
     $$PWD/qv8domerrors.cpp \
     $$PWD/qv8sqlerrors.cpp \
-    $$PWD/qqmlbuiltinfunctions.cpp
\ No newline at end of file
+    $$PWD/qqmlbuiltinfunctions.cpp