public com.google.type.Date.Builder getStartDateBuilder() {
      bitField0_ |= 0x00000002;
      onChanged();
      return getStartDateFieldBuilder().getBuilder();
    }
<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