How do I register the system date?

You could format the date,

$date->format('Y-m-d');

https://www.php.net/manual/en/function.date.php

https://www.w3schools.com/php/func_date_date_format.asp

In your model make sure you use protected $dates = ['registered_at'];. Then in your blade file you can grab the date from the array and format it such as $news->registered_at->format('d/m/y');

I did it that way

   $created = new DateTime();
   $news->date = $created->format('d/m/y');

But in the database it saves with this format ('y / m / d')

Bank, do you mean database table?

Your database date column type will have Y-m-d format, you can modify how this is displayed in your view layer. As @ollie_123 mentioned, you can cast fields on the model to Carbon instances, and use the format method to render them however you please.