On Thu, Aug 6, 2009 at 7:27 PM, Jim Brunette <ca...@brownhare.com> wrote:
> Is there a lat/lon database that contains the timezone boundaries? > > With a lat/long TZ DB, users could input their city or zip (or heck, if > they know it, their lat/lon), then the app would associate the user's > lat/lon with the TZ lat/lon and output the TZ (if the user's lat/lon was > not found, the app would just fall back to the continent/city names). > > To take it one step further, mobile apps with GPS have real-time > lat/lon, so getting the TZ should be easy... How useful such an mobile > app would be is another question. > > Jim > > > > > > geonames.org provides this, via a simple HTTP interface. Here's a blog post describing usage: http://vancouverwebconsultants.com/getting-time-zone-from-latitude-longitude/(though in PHP) To fetch, it's very simple: http://ws.geonames.org/timezone?lat=$lat&lng=$lng -J
