Covert date with pluck

$dates = $child->events()->pluck('start_date');

That will give you a collection of the 'start_date' properties of your events.

If you make sure to 'tell Laravel' to interpret them as dates in you Event.php model, the 'start_date' property will automatically be converted into a Carbon instance.

// Event.php
public $dates = ['start_date'];

Thanks for your comment John,

I have asked my question incorrectly, I want to give the date a different format, now the times comes with.

Thanks in advance

@MARLONV - Can you try to perform a map operation on the dates collection?

$dates = $child->events()->pluck('start_date');

$formattedDates = $dates->map(function ($date) {
   return $date->format('d:m:Y');
});

Now your $formattedDates will contain a collection of dates that follow the appropriate format. If you want to convert it to an array, just chain ->toArray():

$formattedDates = $dates->map(function ($date) {
   return $date->format('d:m:Y');
})->toArray();

You can also set the default date format on the model itself

class Event extends Model
{
    protected $dateFormat = 'd:m:Y';

    protected $dates = ['start_date'];
}