GeoTimeZone [](https://www.nuget.org/packages/GeoTimeZone/) =========== Provides an IANA time zone identifier from latitude and longitude coordinates. ## Nuget Installation ```powershell PM> Install-Package GeoTimeZone ``` ## Supported Environments As of version 5.0.0, *GeoTimeZone* works with all of the following: - .NET 5 or greater - .NET Core 2.0 or greater - .NET Framework 4.6.2 and greater Note that .NET Framework versions less than 4.6.2 are no longer supported. ## Example Usage ```csharp string tz = TimeZoneLookup.GetTimeZone(50.4372, -3.5559).Result; // "Europe/London" ``` ## Usage Notes This library returns [IANA time zone IDs](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones). If you need a Windows time zone ID, pass the return value into the [TimeZoneConverter](https://github.com/mattjohnsonpint/TimeZoneConverter) library's `TZConvert.IanaToWindows` method, or to `TZConvert.GetTimeZoneInfo` to get a `TimeZoneInfo` object in a platform-neutral manner. This library uses the time zone border definitions from the [Timezone Boundary Builder][1] project, which in-turn derive from [Open Street Map][2]. As some international borders are the subject of dispute, the results may or may not align with your worldview. Use at your own risk. ## Acknowledgements Huge thank you to the following people: - Evan Siroky, who tirelessly maintains the Time Zone Boundary Builder project, which we use for our source data. - Eric Muller, who authored the original tz_world data set (now deprecated in favor of TBB). - Simon Bartlett, who contributed all the polygon indexing and lookup bits to this library. - Sharon Lourduraj, who wrote GeoHash-net that we used for our original implementation. - David Troy, who wrote Geohash-js that Sharon later ported to .NET - Nick Johnson, who's [excellent blog post](http://blog.notdot.net/2009/11/Damn-Cool-Algorithms-Spatial-indexing-with-Quadtrees-and-Hilbert-Curves) has been an inspiration to this project and so many others! - Jonas Nyrup, who has helped with performance optimizations. ## License This library is provided free of charge, under the terms of the [MIT license][3]. [1]: https://github.com/evansiroky/timezone-boundary-builder [2]: https://www.openstreetmap.org/ [3]: https://github.com/mattjohnsonpint/GeoTimeZone/blob/master/LICENSE