User.php

<?php

// [...]

/**
 * The attributes that are mass assignable.
 *
 * @var array
 */
protected $fillable = [
    'name', 'email', 'password', 'confirmation_token'
];

/**
 * The attributes that should be casted to a Carbon instance.
 * 
 * @var array 
 */
protected $dates = [
    'created_at', 'updated_at', 'confirmed_at'
];

// [...]