serverfireteam / panel如何格式化datetime？

im using serverfireteam/panel from https://github.com/serverfireteam/panel.

I have build this controller with a datetime value:

class TransportController extends CrudController{

public function all($entity){
    parent::all($entity); 
    $this->filter = \DataFilter::source(new \App\Transport);
    $this->filter->add('datum', 'Datum', 'datetime');
    $this->filter->submit('search');
    $this->filter->reset('reset');
    $this->filter->build();

    $this->grid = \DataGrid::source($this->filter);
    $this->grid->add('nummer', 'Nummer');
    $this->grid->add('datum', 'datum');
    $this->grid->add('spediteur_id',"Spediteur Id");
    $this->grid->add('fahrer_id',"Fahrer Id");
    $this->grid->add('fahrzeug_id',"Fahrzeug Id");

    $this->grid->add('transportkosten',"Transportkosten");
    $this->addStylesToGrid();

    return $this->returnView();
}

...

}

I like to format the datetime value (like $this->grid->add('datum', 'datum')->format('d.m.Y');) but I couldn't find the function to format it.

In Laravel you will use Carbon to format dates (and more)

Add this at the top of your controller:

use Carbon\Carbon;

And then you can use it so:

    $date = Carbon\Carbon::createFromFormat('d/m/Y', '11/06/1990');

With carbon you can do several things as for example:

Carbon::now()->year

Read the documentation it will be very useful:

http://laravel.com/docs/5.1/eloquent-mutators