--- a/nashorn/src/jdk/nashorn/internal/objects/NativeDate.java	Wed Apr 17 15:36:48 2013 -0300
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeDate.java	Thu Apr 18 15:50:30 2013 +0530
@@ -851,11 +851,11 @@
         }
         final ScriptObject sobj  = (ScriptObject)selfObj;
         final Object       value = sobj.getDefaultValue(Number.class);
-
-        final double num = (value instanceof Number) ? ((Number)value).doubleValue() : NaN;
-
-        if (isInfinite(num) || isNaN(num)) {
-            return null;
+        if (value instanceof Number) {
+            final double num = ((Number)value).doubleValue();
+            if (isInfinite(num) || isNaN(num)) {
+                return null;
+            }
         }
 
         try {

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8012462.js	Thu Apr 18 15:50:30 2013 +0530
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ * 
+ * This code 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 General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * JDK-8012462: Date.prototype.toJSON does not handle non-Date 'this' as per the spec.
+ *
+ * @test
+ * @run
+ */
+
+var toJSON = Date.prototype.toJSON;
+
+function checkJSON(value, expected) {
+    var res = toJSON.call({
+        valueOf: function() { return value; },
+        toISOString: function() { return value; }
+    });
+
+    if (res !== expected) {
+        fail("Date.prototype.toJSON does not work for non-Date 'this'");
+    }
+}
+
+checkJSON(NaN, null);
+checkJSON(-Infinity, null);
+checkJSON(Infinity, null);
+checkJSON("foo", "foo");