nexusphp/app/Models/NexusModel.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class NexusModel extends Model
{
    use HasFactory;

    public $timestamps = false;

    protected $perPage = 50;

    /**
     *
     * @param  \DateTimeInterface  $date
     * @return string
     */
    protected function serializeDate(\DateTimeInterface $date)
    {
        return $date->format($this->dateFormat ?: 'Y-m-d H:i:s');
    }

    /**
     * Check is valid date string
     *
     * @see https://stackoverflow.com/questions/19271381/correctly-determine-if-date-string-is-a-valid-date-in-that-format
     * @param $name
     * @param string $format
     * @return bool
     */
    public function isValidDate($name, $format = 'Y-m-d H:i:s'): bool
    {
        $date = $this->getRawOriginal($name);
        $d = \DateTime::createFromFormat($format, $date);
        // The Y ( 4 digits year ) returns TRUE for any integer with any number of digits so changing the comparison from == to === fixes the issue.
        return $d && $d->format($format) === $date;
    }

}