lastVisitDate for ProviderSlots

public function lastVisitDate($patient_id, $facility_id) {
        $start = Time::now()->toDateString(); // today
        $events = TableRegistry::get('events');
        $events_data = $events->find()
            ->where(['patient_id' => $patient_id])
            ->andWhere(['facility_id' => $facility_id])
            ->andWhere(['events.start < :now'])  // returns the past appointments (not check today)
            ->bind(':now', $start, 'time');

        if($events_data->count() > 1) {
            $event_date = $events_data->limit(2)->orderDesc('id')->first()->start;
            $date1 = $event_date ? strtotime($event_date) : null;    //unix timestamps
        } else {
            $date1 = null;
        }


        $encounters = TableRegistry::get('encounters');

        $encounters_data = $encounters->find()
            ->where(['patient_id' => $patient_id])
            ->andWhere(['facility_id' => $facility_id])
            ->andWhere(['encounters.visitdate < :now'])  // returns the past encounters (not check today)
            ->bind(':now', $start, 'time');

        $encounter_date = $encounters_data->last() ? $encounters_data->last()->visitdate : null;
        $date2 = $encounter_date ? strtotime($encounter_date) : null;


        $prescriptions = TableRegistry::get('prescriptions');
        $prescriptions_data = $prescriptions->find()
            ->where(['patient_id' => $patient_id])
            ->andWhere(['facility_id' => $facility_id])
            ->andWhere(['prescriptions.created < :now'])  // returns the past encounters (not check today)
            ->bind(':now', $start, 'time');

        $prescription_date = $prescriptions_data->last() ? $prescriptions_data->last()->created : null;
        $date3 = $prescription_date ? strtotime($prescription_date) : null;

        if( ($date1 > $date2) && ($date1 > $date3) ) {
            //debug((new Time($date1))->timeAgoInWords()); exit;
            return $date1;
        } elseif ( ($date2 > $date3) && ($date2 > $date1) ) {
            //debug($date2); exit;
            return $date2;
        } else {
            //debug($date3); exit;
            return $date3;
        }

    }