public function getLastExecutionTime($jobCode)
    {
        if ($this->isDisabled($jobCode)) {
            return false;
        }
        $schedules = Mage::getModel('cron/schedule')->getCollection(); /* @var $schedules Mage_Cron_Model_Mysql4_Schedule_Collection */
        $schedules->getSelect()->limit(1)->order('executed_at DESC');
        $schedules->addFieldToFilter(
            array('status'),
            array(
                array('eq' => Aoe_Scheduler_Model_Schedule::STATUS_SUCCESS),
                array('eq' => Aoe_Scheduler_Model_Schedule::STATUS_REPEAT)
            )
        );

        $schedules->addFieldToFilter('job_code', $jobCode);
        $schedules->load();
        if (count($schedules) == 0) {
            return false;
        }
        $executedAt = $schedules->getFirstItem()->getExecutedAt();
        $value = Mage::getModel('core/date')->date(null, $executedAt);
        return $value;
    }