public Builder setLastModifiedBefore(com.google.protobuf.Timestamp.Builder builderForValue) {
        if (lastModifiedBeforeBuilder_ == null) {
          lastModifiedBefore_ = builderForValue.build();
        } else {
          lastModifiedBeforeBuilder_.setMessage(builderForValue.build());
        }
        bitField0_ |= 0x00000020;
        onChanged();
        return this;
      }
<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