public com.google.protobuf.TimestampOrBuilder getLastModifiedBeforeOrBuilder() {
        if (lastModifiedBeforeBuilder_ != null) {
          return lastModifiedBeforeBuilder_.getMessageOrBuilder();
        } else {
          return lastModifiedBefore_ == null
              ? com.google.protobuf.Timestamp.getDefaultInstance()
              : lastModifiedBefore_;
        }
      }
<pre>
If specified, only objects with a "last modification time" before this
timestamp and objects that don't have a "last modification time" are
transferred.
</pre>

<code>.google.protobuf.Timestamp last_modified_before = 6;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java