Laravel中自动维护的created_at和updated_at字段的字段类型应该是什么？

Timestamp?Int?

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http://www.golaravel.com/laravel/docs/5.0/eloquent/#timestamps

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laravel框架中默认的ORM模型created_at,updated_at字段的数据类型是datetime
也可以改为int

public function fromDateTime($value){
        return strtotime(parent::fromDateTime($value));
    }