Geo2tz

This gem enables you to find a timezone given a set of latitude and longitude.

In order to do that It parses a list of all the cities from geonames.org and setup a Kdtree to find to closest city to your given coordinates and returns the associated timezone.

Add this line to your application's Gemfile:

gem 'geo2tz'

And then execute:

$ bundle

Or install it yourself as:

$ gem install geo2tz

In order to work this gem needs to download, parse and store a file from geonames.org. It therefore needs to store that file somewhere. you need to specify a writable directory where It can write to.

# config/initializers/geo2tz.rb
Geo2tz.configure(
  :writable_directory => '/myproject/files,
  :filename => 'geo2tz.db' # Optional,
  :geoname_url => 'http://download.geonames.org/export/dump/cities1000.zip',
  :geoname_filename => 'cities1000.txt'
)

To setup your cities database file.

Geo2tz::Updater.new

To search use the lat_long method

Geo2tz::Search.lat_long(-18,31)
=> (GMT+02:00) Africa/Harare

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request