我试过了：
$date = "2016-11-24 11:59:56";$date->addHour();
$date = Carbon::parse('2016-11-24 11:59:56')->addHour();
更好的方法是将datetime列添加到dates变量：
protected $dates = ['datetime_column'];
然后你可以这样做：
$date = $model->datetime_column->addHour();
