# File ../../auditor/lib/kasp_auditor/changed_config.rb, line 308
    def get_signature_timestamp
      # Get the earliest signature-related timestamp which is not 0
      min_timestamp = 999999999999
      [@rrsig_inception_offset, @rrsig_refresh, @rrsig_resign, @rrsig_jitter,
       @rrsig_validity_default, @rrsig_validity_denial].each {|el|
        if ((el.timestamp > 0) && (el.timestamp < min_timestamp))
          min_timestamp = el.timestamp
        end
      }
      if (min_timestamp == 999999999999)
        return 0
      else
        return min_timestamp
      end
    end