laravel 修改created_at默认存储方式

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<?php namespace Pcb\Model; use  Illuminate\Database\Eloquent\Model  as Eloquent;   class PcbOrder extends Eloquent {     protected $connection="pcb";     protected $table = 'order';     protected $primaryKey = 'order_id';     const CREATED_AT = 'create_time';     const UPDATED_AT = 'update_time';     public $timestamps = true;             public function fromDateTime($value){         return strtotime(parent::fromDateTime($value));     }                                     }