Do not raise an error if the browser-specified timezone is not recogn…

…ized

lib/browser-timezone-rails.rb

@@ -12,7 +12,7 @@ def self.included(base)
 
     def set_time_zone(&action)
       # Use existing methods to simplify filter
-      Time.use_zone(browser_timezone.presence || Time.zone, &action)
+      Time.use_zone(Time.find_zone(browser_timezone.presence) || Time.zone, &action)
     end
 
     def browser_timezone

spec/request/set_timezone_spec.rb

@@ -1,7 +1,6 @@
 require 'spec_helper'
 
-
-describe 'sets the timezone' do
+describe 'sets the timezone', type: :request do
 
   before do
     #Rails server timezone is UTC...
@@ -27,6 +26,17 @@
     end
   end
 
+  context 'invalid timezone' do
+    before do
+      page.driver.browser.set_cookie "browser.timezone=Something/Invalid"
+      visit '/timezone'
+    end
+
+    it 'does not raise an error' do
+      page.should have_content "UTC"
+    end
+  end
+
   context 'on the first request ever, there will be no cookie, and nothing happens' do
 
     before do