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diff --git a/js/src/tests/ecma/Date/15.9.5.js b/js/src/tests/ecma/Date/15.9.5.js
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+++ b/js/src/tests/ecma/Date/15.9.5.js
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+/* -*- tab-width: 2; indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+/**
+   File Name:          15.9.5.js
+   ECMA Section:       15.9.5 Properties of the Date prototype object
+   Description:
+
+   The Date prototype object is itself a Date object (its [[Class]] is
+   "Date") whose value is NaN.
+
+   The value of the internal [[Prototype]] property of the Date prototype
+   object is the Object prototype object (15.2.3.1).
+
+   In following descriptions of functions that are properties of the Date
+   prototype object, the phrase "this Date object" refers to the object that
+   is the this value for the invocation of the function; it is an error if
+   this does not refer to an object for which the value of the internal
+   [[Class]] property is "Date". Also, the phrase "this time value" refers
+   to the number value for the time represented by this Date object, that is,
+   the value of the internal [[Value]] property of this Date object.
+
+   Author:             christine@netscape.com
+   Date:               12 november 1997
+*/
+
+var SECTION = "15.9.5";
+var VERSION = "ECMA_1";
+startTest();
+var TITLE   = "Properties of the Date Prototype Object";
+
+writeHeaderToLog( SECTION + " "+ TITLE);
+
+
+Date.prototype.getClass = Object.prototype.toString;
+
+new TestCase( SECTION,
+	      "Date.prototype.getClass",
+	      "[object Object]",
+	      Date.prototype.getClass() );
+new TestCase( SECTION,
+	      "Date.prototype.valueOf()",
+	      "TypeError",
+	      (function() { try { Date.prototype.valueOf() } catch (e) { return e.constructor.name; } })());
+new TestCase( SECTION,
+          "Date.prototype.__proto__ == Object.prototype",
+          true,
+          Date.prototype.__proto__ == Object.prototype );
+test();