How did we get started with this? We were working on a project for international travelers and needed time zone data to complete the job. We expected it to be easy -- surely someone, perhaps the United Nations, would have this data available. Instead, we found that no one really knew the right data for EVERY location. We looked in books, atlases, and web sites and found nothing we could depend on. The available resources either avoided areas that were difficult to determine, provided disclaimers that they were "not guaranteed to be accurate" or provided information that was just plain wrong or outdated.