[date] Date parser says true even for wrong dates, check twice.

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index 59d04f886107e42b6b31f768def44f673581ab34..ae707a96aaf9742dbb584443419de83a3c9ec3b6 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -2096,7 +2096,9 @@ double ParseDateTimeString(Handle<String> str) {
                                tmp->get(5)->Number(), tmp->get(6)->Number());
   double date = MakeDate(day, time);
   if (tmp->get(7)->IsNull()) {
-    date = isolate->date_cache()->ToUTC(static_cast<int64_t>(date));
+    if (!std::isnan(date)) {
+      date = isolate->date_cache()->ToUTC(static_cast<int64_t>(date));
+    }
   } else {
     date -= tmp->get(7)->Number() * 1000.0;
   }