# File lib/logging/layouts/parseable.rb, line 215
    def format_obj( obj )
      case obj
      when Exception
        h = { :class   => obj.class.name,
              :message => obj.message }
        h[:backtrace] = obj.backtrace if @backtrace && !obj.backtrace.nil?
        h
      when Time
        iso8601_format(obj)
      else
        obj
      end
    end