Cake\Chronos\Traits\ModifierTrait::endOfDecade PHP 메소드

    public function endOfDecade()
    {
        $year = $this->year - $this->year % ChronosInterface::YEARS_PER_DECADE + ChronosInterface::YEARS_PER_DECADE - 1;
        return $this->modify("last day of december {$year}, 23:59:59");
    }