diff --git a/src/app/Http/Controllers/API/V4/FsController.php b/src/app/Http/Controllers/API/V4/FsController.php
--- a/src/app/Http/Controllers/API/V4/FsController.php
+++ b/src/app/Http/Controllers/API/V4/FsController.php
@@ -794,6 +794,9 @@
             $result += $props;
         }
 
+        $result['updated_at'] = $object->updated_at->toDateTimeString();
+        $result['created_at'] = $object->created_at->toDateTimeString();
+
         return $result;
     }
 
diff --git a/src/tests/Feature/Controller/FsTest.php b/src/tests/Feature/Controller/FsTest.php
--- a/src/tests/Feature/Controller/FsTest.php
+++ b/src/tests/Feature/Controller/FsTest.php
@@ -452,6 +452,8 @@
         $json = $response->json();
 
         $this->assertSame($file->id, $json['id']);
+        $this->assertSame($file->updated_at->toDateTimeString(), $json['updated_at']);
+        $this->assertSame($file->created_at->toDateTimeString(), $json['created_at']);
         $this->assertSame($file->getProperty('mimetype'), $json['mimetype']);
         $this->assertSame((int) $file->getProperty('size'), $json['size']);
         $this->assertSame($file->getProperty('name'), $json['name']);