public Builder setRevisionCreateTime(com.google.protobuf.Timestamp value) {
      if (revisionCreateTimeBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        revisionCreateTime_ = value;
      } else {
        revisionCreateTimeBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000040;
      onChanged();
      return this;
    }
<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