public Builder mergeTargetDatetime(com.google.type.DateTime value) {
      if (targetDatetimeBuilder_ == null) {
        if (((bitField0_ & 0x00000040) != 0)
            && targetDatetime_ != null
            && targetDatetime_ != com.google.type.DateTime.getDefaultInstance()) {
          getTargetDatetimeBuilder().mergeFrom(value);
        } else {
          targetDatetime_ = value;
        }
      } else {
        targetDatetimeBuilder_.mergeFrom(value);
      }
      if (targetDatetime_ != null) {
        bitField0_ |= 0x00000040;
        onChanged();
      }
      return this;
    }
<pre>
The date for which report is generated. The time part of target_datetime
will be zero till we support multiple reports per day.
</pre>

<code>.google.type.DateTime target_datetime = 6;</code>
java-storageinsights/proto-google-cloud-storageinsights-v1/src/main/java/com/google/cloud/storageinsights/v1/ReportDetail.java