How can I get the timezone of given gps coordinates on iPhone?

My question is simple. I have the GPS coordin开发者_开发知识库ates of a place and I need to know, in what time zone (and daylight saving settings) is on that place. Is any easy solution for this problem in objective c?

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It doesn't look like the MKReverseGeocoder class added in MapKit with 3.0 will give you such information, unfortunately. That might make for a good Radar enhancement request, eh? (http://bugreporter.apple.com)

However, with a quick Google search, I found http://www.earthtools.org/webservices.htm#timezone - it appears you could query that and get a nice XML result back. Just be sure to obey the usage restrictions listed at the top of that page.

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DRT Engine can give you a timezone offset based on latitude/longitude coordinates and a datetime value.

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Geonames.org has a REST style free web service that provides geolocation to timezone conversion under CC attribution license. Response is XML or JSON.