Fix Date.prototype.setTime

This fixes #58

builtin_date.go

@@ -100,8 +100,10 @@ func builtinDate_getTime(call FunctionCall) Value {
 }
 
 func builtinDate_setTime(call FunctionCall) Value {
-	date := dateObjectOf(call.thisObject())
+	object := call.thisObject()
+	date := dateObjectOf(object)
 	date.Set(toFloat(call.Argument(0)))
+	object.value = date
 	return date.Value()
 }
 

date_test.go

@@ -421,3 +421,20 @@ func TestDate_setFullYear(t *testing.T) {
 	test(`Date.prototype.setFullYear.length`, "3")
 	test(`Date.prototype.setUTCFullYear.length`, "3")
 }
+
+func TestDate_setTime(t *testing.T) {
+	Terst(t)
+
+	defer mockTimeLocal(Time.UTC)()
+
+	test := runTest()
+
+	test(`
+        var abc = new Date(1999, 6, 1);
+        var def = new Date();
+        def.setTime(abc.getTime());
+        [ def, abc.valueOf() == def.valueOf() ];
+    `, "Thu, 01 Jul 1999 00:00:00 UTC,true")
+
+	test(`Date.prototype.setTime.length`, "1")
+}