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diff --git a/WebCore/html/BaseDateAndTimeInputType.cpp b/WebCore/html/BaseDateAndTimeInputType.cpp
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+++ b/WebCore/html/BaseDateAndTimeInputType.cpp
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+/*
+ * Copyright (C) 2010 Google Inc. 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 "config.h"
+#include "BaseDateAndTimeInputType.h"
+
+#include "DateComponents.h"
+#include "HTMLInputElement.h"
+#include "HTMLNames.h"
+#include <limits>
+#include <wtf/MathExtras.h>
+#include <wtf/PassOwnPtr.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+using namespace HTMLNames;
+using namespace std;
+
+static const double msecPerMinute = 60 * 1000;
+static const double msecPerSecond = 1000;
+
+double BaseDateAndTimeInputType::valueAsDate() const
+{
+    return parseToDouble(element()->value(), DateComponents::invalidMilliseconds());
+}
+
+void BaseDateAndTimeInputType::setValueAsDate(double value, ExceptionCode&) const
+{
+    element()->setValue(serialize(value));
+}
+
+double BaseDateAndTimeInputType::valueAsNumber() const
+{
+    return parseToDouble(element()->value(), numeric_limits<double>::quiet_NaN());
+}
+
+void BaseDateAndTimeInputType::setValueAsNumber(double newValue, ExceptionCode&) const
+{
+    element()->setValue(serialize(newValue));
+}
+
+bool BaseDateAndTimeInputType::typeMismatchFor(const String& value) const
+{
+    return !value.isEmpty() && !parseToDateComponents(value, 0);
+}
+
+bool BaseDateAndTimeInputType::typeMismatch() const
+{
+    return typeMismatchFor(element()->value());
+}
+
+bool BaseDateAndTimeInputType::rangeUnderflow(const String& value) const
+{
+    const double nan = numeric_limits<double>::quiet_NaN();
+    double doubleValue = parseToDouble(value, nan);
+    return isfinite(doubleValue) && doubleValue < minimum();
+}
+
+bool BaseDateAndTimeInputType::rangeOverflow(const String& value) const
+{
+    const double nan = numeric_limits<double>::quiet_NaN();
+    double doubleValue = parseToDouble(value, nan);
+    return isfinite(doubleValue) && doubleValue > maximum();
+}
+
+bool BaseDateAndTimeInputType::stepMismatch(const String& value, double step) const
+{
+    const double nan = numeric_limits<double>::quiet_NaN();
+    double doubleValue = parseToDouble(value, nan);
+    doubleValue = fabs(doubleValue - stepBase());
+    if (!isfinite(doubleValue))
+        return false;
+    ASSERT(round(doubleValue) == doubleValue);
+    ASSERT(round(step) == step);
+    return fmod(doubleValue, step);
+}
+
+double BaseDateAndTimeInputType::stepBase() const
+{
+    return parseToDouble(element()->fastGetAttribute(minAttr), defaultStepBase());
+}
+
+double BaseDateAndTimeInputType::parseToDouble(const String& src, double defaultValue) const
+{
+    DateComponents date;
+    if (!parseToDateComponents(src, &date))
+        return defaultValue;
+    double msec = date.millisecondsSinceEpoch();
+    ASSERT(isfinite(msec));
+    return msec;
+}
+
+bool BaseDateAndTimeInputType::parseToDateComponents(const String& source, DateComponents* out) const
+{
+    if (source.isEmpty())
+        return false;
+    DateComponents ignoredResult;
+    if (!out)
+        out = &ignoredResult;
+    return parseToDateComponentsInternal(source.characters(), source.length(), out);
+}
+
+String BaseDateAndTimeInputType::serialize(double value) const
+{
+    if (!isfinite(value))
+        return String();
+    DateComponents date;
+    if (!setMillisecondToDateComponents(value, &date))
+        return String();
+    double step;
+    if (!element()->getAllowedValueStep(&step))
+        return date.toString();
+    if (!fmod(step, msecPerMinute))
+        return date.toString(DateComponents::None);
+    if (!fmod(step, msecPerSecond))
+        return date.toString(DateComponents::Second);
+    return date.toString(DateComponents::Millisecond);
+}
+
+} // namespace WebCore