if "object" doesn't respond to the method specified, it was throwing …

…an error. Fixed (thanks, Joe Tanner!)

lib/calendar_date_select.rb

@@ -154,7 +154,7 @@ def calendar_date_select(object, method, options={})
       use_time = options[:time]
 
       if options[:time].to_s=="mixed"
-        use_time = false if Date===obj.send(method)
+        use_time = false if Date===(obj.respond_to?(method) && obj.send(method))
       end
 
       calendar_options = calendar_date_select_process_options(options)