Get time zone id of a location by latitude and longitude (lat, lng).

google_timezone.rb

# See: https://developers.google.com/maps/documentation/timezone/
# Uses HTTParty gem (https://github.com/jnunemaker/httparty).
# Usage:
#   GoogleTimezone.search(:lat => 51.38494009999999, :lng => -0.3514683)['timeZoneId']
class GoogleTimezone

  include HTTParty

  base_uri 'https://maps.googleapis.com'

  # https://maps.googleapis.com/maps/api/timezone/json?location=39.6034810,-119.6822510&timestamp=1331161200&sensor=true_or_false
  def self.search(query)
    query[:location] = "#{query.delete(:lat)},#{query.delete(:lng)}" if query[:lat] && query[:lng]
    query[:sensor] ||= false
    query[:timestamp] ||= Time.now.to_i
    self.get('/maps/api/timezone/json', :query => query)
  end

end