columns update

examples/simple.php

@@ -9,6 +9,10 @@ $table = new ListJsonTable($json);
 
 //$table->columns([
 $table->columns([
+    [
+        'field' => 'created_at',
+        'format' => 'date:d-m-Y',
+    ],
     'status' => function ($cell) {
         return getStatusLabel()[$cell];
     },