Change cast to include format

https://laravel.com/docs/8.x/eloquent-mutators#date-casting - this doesn’t seem to work tho?
Signed-off-by: snipe <snipe@snipe.net>

app/Models/License.php

@@ -32,10 +32,11 @@ class License extends Depreciable
     protected $guarded = 'id';
     protected $table = 'licenses';
 
+
     protected $casts = [
-        'purchase_date' => 'date',
-        'expiration_date' => 'date',
-        'termination_date' => 'date',
+        'purchase_date' => 'date:Y-m-d',
+        'expiration_date' => 'date:Y-m-d',
+        'termination_date' => 'date:Y-m-d',
         'category_id'  => 'integer',
         'company_id'   => 'integer',
     ];