private com.google.protobuf.MapField<java.lang.String, java.lang.String> internalGetLabels() {
    if (labels_ == null) {
      return com.google.protobuf.MapField.emptyMapField(LabelsDefaultEntryHolder.defaultEntry);
    }
    return labels_;
  }
<pre>
Output only. The timestamp that the latest revision of the workflow
was created.
</pre>

<code>
.google.protobuf.Timestamp revision_create_time = 7 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-workflows/proto-google-cloud-workflows-v1beta/src/main/java/com/google/cloud/workflows/v1beta/Workflow.java