laravel中的碳数据解析问题

我使用的是Laravel5.6和PHP7.2.10

2018-12-24 12:42:00.0 is getting converted to "Dec 24 2018, 12:12 pm"

$dt = App\Video::find(8611)->created_at;
=> Illuminate\Support\Carbon @1545655320 {#3075
     date: 2018-12-24 12:42:00.0 UTC (+00:00),
   }
>>> Carbon\Carbon::parse($dt)->format('M d Y, h:m a')
=> "Dec 24 2018, 12:12 pm"
>>>