OctoberCMS model validation

ModelNeedToValidate.php

<?php 

use Carbon\Carbon;
use Model;
use Validator;
/**
 * Model
 */
class WorkingSchedule extends Model
{
    use \October\Rain\Database\Traits\Validation;
    
    /*
     * Disable timestamps by default.
     * Remove this line if timestamps are defined in the database table.
     */
    public $timestamps = false;

    protected $dates = ['from_time', 'to_time'];

    /*
     * Validation
     */
    public $rules = [
        'from_time'                  => 'required',
        'to_time'                  => 'required|same_day:from_time',

    ];

    public $customMessages = [
        'same_day' => 'The :attribute and :other must match on the same day.'
    ];
    /**
     * @var string The database table used by the model.
     */
    public $table = 'cmgdev_booking_doctor_working_schedule';

    public $belongsTo = [
        'clinic' => [
            'CmgDev\Booking\Models\Clinic',
            'key'=>'clinic_id'
        ],
        'doctor' => [
            'CmgDev\Booking\Models\Doctor',
            'key'=>'doctor_id'
        ]
    ];

    public function beforeSave() {
        /** @var Carbon $date */
        $date = $this->from_time;
        $this->date_key = $date->toDateString();
    }

    protected function beforeValidate() {
        $model = $this;
        Validator::extend('same_day', function($attribute, $value, $parameters) use ($model) {
            /** @var Carbon $date */
            $date = $model->$attribute;
            $dateValue = null;
            if(!empty($date)) {
                $dateValue = $date->toDateString();
            }
            $compareDateAttribute = $parameters[0];
            /** @var Carbon $dateToCompare */
            $dateToCompare = $model->$compareDateAttribute;
            $dateToCompareValue = null;
            if(!empty($dateToCompare)) {
                $dateToCompareValue = $dateToCompare->toDateString();
            }

            return !empty($dateToCompareValue) && $dateToCompareValue === $dateValue;
        });

        Validator::replacer('same_day', function($message, $attribute, $rule, $parameters) {
            return str_replace(':other', $parameters[0], $message);

        });
    }

}