Laravel 7 - Timestamp field becomes ISODate

Question

I have got a problem. When updating the model twice, the updatedAt field becomes from timestamp to ISODate. So after second loop updatedAt is changed to ISODate. Is there any explanation why does it work like this.

for($i = 0; $i < 2; $i++){
    $user = User::find('10');
    $user->mode = rand(1, 10);
    $user->save();
}

"updatedAt" : ISODate("2021-01-28T15:46:16.773Z"),
"createdAt" : 1611844860

Here is the User Model Class:

const CREATED_AT = 'createdAt';
const UPDATED_AT = 'updatedAt';

protected $casts = [
    'createdAt' => 'timestamp',
    'updatedAt' => 'timestamp',
];

public function setCreatedAtAttribute()
{
     $this->attributes['createdAt'] = time();
}

public function setUpdatedAtAttribute()
{
    $this->attributes['updatedAt'] = time();
}

question from:https://stackoverflow.com/questions/65940914/laravel-7-timestamp-field-becomes-isodate

Answer 1

Try to not to use mutators, use protected $dateFormat & $dates instead of $casts nor mutators , e.g

protected $dateFormat = 'U';
protected $dates = ['createdAt', 'updatedAt'];