Fix error handling in Date.prototype.toISOString.

src/date.js

Index: src/date.js
diff --git a/src/date.js b/src/date.js
index ccefce57638812366eb32776b5cbdc6c1d79ebaf..d603671774f341614d59727fb5e3f4cfb1b59b40 100644
--- a/src/date.js
+++ b/src/date.js
@@ -351,13 +351,12 @@ function MakeDay(year, month, date) {
   date = TO_INTEGER_MAP_MINUS_ZERO(date);
 
   if (year < kMinYear || year > kMaxYear ||
-      month < kMinMonth || month > kMaxMonth ||
-      date < kMinDate || date > kMaxDate) {
+      month < kMinMonth || month > kMaxMonth) {
     return $NaN;
   }
 
-  // Now we rely on year, month and date being SMIs.
-  return %DateMakeDay(year, month, date);
+  // Now we rely on year and month being SMIs.
+  return %DateMakeDay(year, month) + date - 1;
 }
 
 
@@ -978,9 +977,10 @@ function PadInt(n, digits) {
 }
 
 
+// ECMA 262 - 15.9.5.43
 function DateToISOString() {
   var t = DATE_VALUE(this);
-  if (NUMBER_IS_NAN(t)) return kInvalidDate;
+  if (NUMBER_IS_NAN(t)) throw MakeRangeError("invalid_time_value", []);
   var year = this.getUTCFullYear();
   var year_string;
   if (year >= 0 && year <= 9999) {