time_zone.rb

module ActiveSupport
  class TimeZone
    module Google
      API = 'https://maps.googleapis.com/maps/api/timezone/json'.freeze
      def from_coordinates(lat, lng)
        params = {
          location: "#{lat},#{lng}",
          timestamp: Time.now.to_i,
          sensor: false
        }
        resp = Faraday.get(API, params)
        zone_id = MultiJson.load(resp.body)['timeZoneId']
        ActiveSupport::TimeZone[zone_id]
      end
    end
    extend Google
  end
end