Validar Data no CakePHP

Model.php

        $validator
            ->add('occurrence_date', 'custom', [
            'rule' => function ($value, $context) {
                Log::write('debug',$value);

                $dia     = intval(substr($value, 0,2));
                $mes     = intval(substr($value, 3,2));
                $ano     = intval(substr($value, 6,4));
                
        
                if(Chronos::createFromDate($ano, $mes, $dia)){
                    return true;
                }
                else
                    return false;
            },
            'message' => 'Data inválida'
        ]);

V2.php

        $validator
            ->add('occurrence_date', 'custom', [
            'rule' => function ($value, $context) {
                Log::write('debug',$value);

                if(Chronos::createFromFormat('d/m/Y',$value)){
                    return true;
                }
                else
                    return false;
            },
            'message' => 'Data inválida'
        ]);