diff --git a/app/models/post.rb b/app/models/post.rb
index 8bd5dab3..73785cad 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -219,7 +219,7 @@ class Post
 
   # La fecha de creación inmodificable del post
   def created_at
-    @metadata[:created_at] ||= MetadataCreatedAt.new(document: document, site: site, layout: layout, name: :created_at, type: :timestamp, post: self, required: true)
+    @metadata[:created_at] ||= MetadataCreatedAt.new(document: document, site: site, layout: layout, name: :created_at, type: :created_at, post: self, required: true)
   end
 
   # Detecta si es un atributo válido o no, a partir de la tabla de la