code: public LocalDate getLocalDate(final String fieldName) {
      try {
        if (_jsonObject.isNull(fieldName)) {
          return null;
        } else {
          return LocalDate.parse(_jsonObject.getString(fieldName), DATE_FORMATTER);
        }
      } catch (JSONException ex) {
        throw new QuandlRuntimeException("Cannot find field", ex);
      }
    }
docs: Get a LocalDate field (converted from a String internally). Throws a QuandlRuntimeException if it cannot find the field
  
  @param fieldName the name of the field
  @return the field value, or null if the field is null