private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpec,
            com.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpec.Builder,
            com.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpecOrBuilder>
        getDatetimeBucketSpecFieldBuilder() {
      if (datetimeBucketSpecBuilder_ == null) {
        if (!(rangeFacetConfigCase_ == 7)) {
          rangeFacetConfig_ =
              com.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpec.getDefaultInstance();
        }
        datetimeBucketSpecBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpec,
                com.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpec.Builder,
                com.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpecOrBuilder>(
                (com.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpec) rangeFacetConfig_,
                getParentForChildren(),
                isClean());
        rangeFacetConfig_ = null;
      }
      rangeFacetConfigCase_ = 7;
      onChanged();
      return datetimeBucketSpecBuilder_;
    }
<pre>
Datetime range facet bucket config.
</pre>

<code>.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpec datetime_bucket_spec = 7;
</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/FacetProperty.java