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diff --git a/Source/WTF/wtf/GregorianDateTime.cpp b/Source/WTF/wtf/GregorianDateTime.cpp
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+++ b/Source/WTF/wtf/GregorianDateTime.cpp
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+/*
+ * Copyright (C) 2012 Patrick Gansterer <paroga@paroga.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS 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 APPLE OR ITS 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 "config.h"
+#include "GregorianDateTime.h"
+
+#include "DateMath.h"
+
+#if OS(WINDOWS)
+#include <windows.h>
+#else
+#include <time.h>
+#endif
+
+namespace WTF {
+
+void GregorianDateTime::setToCurrentLocalTime()
+{
+#if OS(WINDOWS)
+    SYSTEMTIME systemTime;
+    GetLocalTime(&systemTime);
+    TIME_ZONE_INFORMATION timeZoneInformation;
+    DWORD timeZoneId = GetTimeZoneInformation(&timeZoneInformation);
+
+    LONG bias = timeZoneInformation.Bias;
+    if (timeZoneId == TIME_ZONE_ID_DAYLIGHT)
+        bias += timeZoneInformation.DaylightBias;
+    else if (timeZoneId == TIME_ZONE_ID_STANDARD)
+        bias += timeZoneInformation.StandardBias;
+    else
+        ASSERT(timeZoneId == TIME_ZONE_ID_UNKNOWN);
+
+    m_year = systemTime.wYear;
+    m_month = systemTime.wMonth - 1;
+    m_monthDay = systemTime.wDay;
+    m_yearDay = dayInYear(m_year, m_month, m_monthDay);
+    m_weekDay = systemTime.wDayOfWeek;
+    m_hour = systemTime.wHour;
+    m_minute = systemTime.wMinute;
+    m_second = systemTime.wSecond;
+    m_utcOffset = -bias * secondsPerMinute;
+    m_isDST = timeZoneId == TIME_ZONE_ID_DAYLIGHT ? 1 : 0;
+#else
+    tm localTM;
+    time_t localTime = time(0);
+    localtime_r(&localTime, &localTM);
+
+    m_year = localTM.tm_year + 1900;
+    m_month = localTM.tm_mon;
+    m_monthDay = localTM.tm_mday;
+    m_yearDay = localTM.tm_yday;
+    m_weekDay = localTM.tm_wday;
+    m_hour = localTM.tm_hour;
+    m_minute = localTM.tm_min;
+    m_second = localTM.tm_sec;
+    m_isDST = localTM.tm_isdst;
+#if HAVE(TM_GMTOFF)
+    m_utcOffset = localTM.tm_gmtoff;
+#else
+    int utcOffset = calculateUTCOffset();
+    utcOffset += calculateDSTOffset(localTime * msPerSecond, utcOffset);
+    m_utcOffset = utcOffset / msPerSecond;
+#endif
+#endif
+}
+
+} // namespace WTF