private com.google.protobuf.SingleFieldBuilderV3<
              com.google.protobuf.Timestamp,
              com.google.protobuf.Timestamp.Builder,
              com.google.protobuf.TimestampOrBuilder>
          getEndTimeFieldBuilder() {
        if (endTimeBuilder_ == null) {
          endTimeBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.protobuf.Timestamp,
                  com.google.protobuf.Timestamp.Builder,
                  com.google.protobuf.TimestampOrBuilder>(
                  getEndTime(), getParentForChildren(), isClean());
          endTime_ = null;
        }
        return endTimeBuilder_;
      }
<pre>
End time of this transfer execution.
</pre>

<code>.google.protobuf.Timestamp end_time = 5;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java