code: public void setStartDate(com.google.api.ads.admanager.axis.v201808.Date startDate) {
          this.startDate = startDate;
      }
docs: Sets the startDate value for this ReportQuery.
  
  @param startDate   * The start date from which the reporting information is gathered.
  The
  {@code ReportQuery#dateRangeType} field must be set
  to
  {@link DateRangeType#CUSTOM_DATE} in order to use
  this.