return when {
          peekHeader.tagClass == Adapters.UTC_TIME.tagClass &&
            peekHeader.tag == Adapters.UTC_TIME.tag -> {
            Adapters.UTC_TIME.fromDer(reader)
          }
          peekHeader.tagClass == Adapters.GENERALIZED_TIME.tagClass &&
            peekHeader.tag == Adapters.GENERALIZED_TIME.tag -> {
            Adapters.GENERALIZED_TIME.fromDer(reader)
          }