private boolean signDifferenceBetweenEarnings(
      LocalDate currentEarningDate, LocalDate historicalEarningsDate) {
    int YEAR_AND_A_HALF_IN_DAYS = 528;
    if ((currentEarningDate.toEpochDay() - historicalEarningsDate.toEpochDay())
        > YEAR_AND_A_HALF_IN_DAYS) {
      return true;
    }

    return false;
  }