title: Date format in iPhone 4 app not changed when changing Region Format in Settings
body: <p>Changing the region format on an iPhone 4 does not change the date and number format in my app until the iPhone is switched off and on again (or the app is terrminated in another way).</p>
  
  <p>Is there a way to detect Region Format changes in UIApplicationDelegate::OnActivated?</p>
  
  <p>I can reset my app there, but it seems that DateTime::ToShortDateString() still is using the old region settings. Is it possible to change that?</p>