Fix Date construct helper

Correct behaviour of step 8, 15.9.3.1, ECMA-262 v5.1.
 - Change ToInt32(y) to ToInteger(y).
 - If ToInteger(y) is not between 0 and 99 then yr = y

Related issue: #1071

JerryScript-DCO-1.0-Signed-off-by: Hanjoung Lee hanjoung.lee@samsung.com

JerryScript-DCO-1.0-Signed-off-by: Hanjoung Lee hanjoung.lee@samsung.com

tests/jerry/regression-test-issue-1071.js

@@ -0,0 +1,23 @@
+// Copyright 2016 Samsung Electronics Co., Ltd.
+// Copyright 2016 University of Szeged.
+//
+// Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var d = new Date(864858163349847396, 1, 1, 1, 1, 1, 1, 1)
+assert (d.toGMTString() === "Invalid Date");
+
+d = new Date(864858, 1, 1, 1, 1, 1, 1, 1)
+assert (d.toGMTString() === "Invalid Date");
+
+d = new Date(86485, 1, 1, 1, 1, 1, 1, 1)
+assert (d.toGMTString() !== "Invalid Date");