diff --git a/app/Transformers/Api/Application/LocationTransformer.php b/app/Transformers/Api/Application/LocationTransformer.php
index dd65b33c3..0e5c857c6 100644
--- a/app/Transformers/Api/Application/LocationTransformer.php
+++ b/app/Transformers/Api/Application/LocationTransformer.php
@@ -26,8 +26,8 @@ class LocationTransformer extends Transformer
             'id' => $model->id,
             'short' => $model->short,
             'long' => $model->long,
-            $model->getUpdatedAtColumn() => $this->formatTimestamp($model->updated_at),
-            $model->getCreatedAtColumn() => $this->formatTimestamp($model->created_at),
+            $model->getUpdatedAtColumn() => self::formatTimestamp($model->updated_at),
+            $model->getCreatedAtColumn() => self::formatTimestamp($model->created_at),
         ];
     }
 
diff --git a/app/Transformers/Api/Application/NodeTransformer.php b/app/Transformers/Api/Application/NodeTransformer.php
index 6e6dcc7d9..c0f3b756f 100644
--- a/app/Transformers/Api/Application/NodeTransformer.php
+++ b/app/Transformers/Api/Application/NodeTransformer.php
@@ -24,8 +24,8 @@ class NodeTransformer extends Transformer
     {
         $response = $model->toArray();
 
-        $response[$model->getUpdatedAtColumn()] = $this->formatTimestamp($model->updated_at);
-        $response[$model->getCreatedAtColumn()] = $this->formatTimestamp($model->created_at);
+        $response[$model->getUpdatedAtColumn()] = self::formatTimestamp($model->updated_at);
+        $response[$model->getCreatedAtColumn()] = self::formatTimestamp($model->created_at);
 
         $resources = $model->servers()->select(['memory', 'disk'])->get();