NearestTimeZone

Quickly find the name of a time zone for a latitude and longitude without relying on a web service.

NearestTimeZone.to(41.85, -87.65)
=> "America/Chicago"

On a whatever MacBook Air, the time to lookup a single time zone is ~0.000030 seconds. Fast.

About

GeoNames Source Data

The city data is based on the GeoNames cities1000.zip data. To compress the size of the gem, the latitudes and longitudes were rounded to one decimal point of precision.

Kdtree

The Geokdtree gem is used to make the search so fast.

Installation

Add this line to your application's Gemfile:

gem 'nearest_time_zone_jruby'

And then execute:

$ bundle

Or install it yourself as:

$ gem install nearest_time_zone_jruby

Contributing

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