private com.google.protobuf.SingleFieldBuilderV3<
            com.google.type.Date, com.google.type.Date.Builder, com.google.type.DateOrBuilder>
        getStartDateFieldBuilder() {
      if (startDateBuilder_ == null) {
        startDateBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.type.Date, com.google.type.Date.Builder, com.google.type.DateOrBuilder>(
                getStartDate(), getParentForChildren(), isClean());
        startDate_ = null;
      }
      return startDateBuilder_;
    }
<pre>
The date from which report generation should start.
UTC time zone.
</pre>

<code>.google.type.Date start_date = 2;</code>
java-storageinsights/proto-google-cloud-storageinsights-v1/src/main/java/com/google/cloud/storageinsights/v1/FrequencyOptions.java