update

# File activerecord/lib/active_record/timestamp.rb, line 60
    def update(*args) #:nodoc:
      if should_record_timestamps?
        current_time = current_time_from_proper_timezone

        timestamp_attributes_for_update_in_model.each do |column|
          column = column.to_s
          next if attribute_changed?(column)
          write_attribute(column, current_time)
        end
      end
      super
    end