Invalidate defaultObjects if timezone changes

test/cctest/test-date.cc

Index: test/cctest/test-date.cc
diff --git a/test/cctest/test-date.cc b/test/cctest/test-date.cc
index 67b950159292d2e15c648008f2fb7d9fd4f151f4..c2f196c0a48a5fecc90eb9f5df8b6b88b01fa7a6 100644
--- a/test/cctest/test-date.cc
+++ b/test/cctest/test-date.cc
@@ -166,3 +166,26 @@ TEST(DaylightSavingsTime) {
   CheckDST(august_20 + 2 * 3600 - 1000);
   CheckDST(august_20);
 }
+
+#ifdef V8_I18N_SUPPORT
+TEST(DateCacheVersion) {
+  FLAG_allow_natives_syntax = true;
+  v8::Isolate* isolate = CcTest::isolate();
+  v8::Isolate::Scope isolate_scope(isolate);
+  v8::HandleScope scope(isolate);
+  v8::Local<v8::Context> context = v8::Context::New(isolate);
+  v8::Context::Scope context_scope(context);
+  v8::Local<v8::Number> date_cache_version =
+      v8::Local<v8::Number>::Cast(CompileRun("%DateCacheVersion()"));
+
+  CHECK(date_cache_version->IsNumber());
+  CHECK_EQ(0.0, date_cache_version->NumberValue(context).FromMaybe(-1.0));
+
+  v8::Date::DateTimeConfigurationChangeNotification(isolate);
+
+  date_cache_version =
+      v8::Local<v8::Number>::Cast(CompileRun("%DateCacheVersion()"));
+  CHECK(date_cache_version->IsNumber());
+  CHECK_EQ(1.0, date_cache_version->NumberValue(context).FromMaybe(-1.0));
+}
+#endif  // V8_I18N_SUPPORT