Minor refactoring.

lib/ar-extensions/import.rb

@@ -22,7 +22,10 @@ class ActiveRecord::Base
   class << self
 
     # use tz as set in ActiveRecord::Base
-    tproc = @@default_timezone == :utc ? lambda { Time.now.utc } : lambda { Time.now }
+    tproc = lambda do
+      ActiveRecord::Base.default_timezone == :utc ? Time.now.utc : Time.now
+    end
+    
     AREXT_RAILS_COLUMNS = {
       :create => { "created_on" => tproc ,
                    "created_at" => tproc },