Como obter um NSDATE da UIImage?

Como obtenho uma data ou metadados de uma UIImage neste caso:

//UIImagePickerControllerSourceType
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

//delegate return
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{

// po info in console -> there is no metadata of the image where i can find the date
// Has anyone an idea how to get it?

}

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