diff --git a/app/models/metadata_created_at.rb b/app/models/metadata_created_at.rb
new file mode 100644
index 00000000..2a7c07ed
--- /dev/null
+++ b/app/models/metadata_created_at.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+# Fecha y hora de creación
+class MetadataCreatedAt < MetadataTemplate
+  # Por defecto la hora actual
+  def default_value
+    Time.now
+  end
+
+  # Nunca cambia
+  def value=(new_value)
+    value
+  end
+end
diff --git a/app/models/post.rb b/app/models/post.rb
index 7eae9594..ffd90e42 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -12,7 +12,7 @@ class Post
   DEFAULT_ATTRIBUTES = %i[site document layout].freeze
   # Otros atributos que no vienen en los metadatos
   PRIVATE_ATTRIBUTES = %i[path slug attributes errors].freeze
-  PUBLIC_ATTRIBUTES = %i[lang date uuid].freeze
+  PUBLIC_ATTRIBUTES = %i[lang date uuid created_at].freeze
   ATTR_SUFFIXES = %w[? =].freeze
 
   attr_reader :attributes, :errors, :layout, :site, :document
@@ -221,6 +221,11 @@ class Post
                                           post: self, required: true)
   end
 
+  # 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)
+  end
+
   # Detecta si es un atributo válido o no, a partir de la tabla de la
   # plantilla
   def attribute?(mid)
@@ -271,7 +276,6 @@ class Post
     # Y que no se procese liquid
     yaml['liquid'] = false
     yaml['usuaries'] = usuaries.map(&:id).uniq
-    yaml['created_at'] ||= modified_at.dup
     yaml['last_modified_at'] = modified_at
 
     "#{yaml.to_yaml}---\n\n#{body}"
diff --git a/app/views/posts/attribute_ro/_created_at.haml b/app/views/posts/attribute_ro/_created_at.haml
new file mode 100644
index 00000000..04f6d716
--- /dev/null
+++ b/app/views/posts/attribute_ro/_created_at.haml
@@ -0,0 +1,4 @@
+%tr{ id: attribute }
+  %th= post_label_t(attribute, post: post)
+  %td{ dir: dir, lang: locale }
+    %time{ datetime: metadata.value.xmlschema }= l metadata.value
diff --git a/app/views/posts/attributes/_created_at.haml b/app/views/posts/attributes/_created_at.haml
new file mode 100644
index 00000000..0aab9802
--- /dev/null
+++ b/app/views/posts/attributes/_created_at.haml
@@ -0,0 +1 @@
+-# nada
diff --git a/config/locales/en.yml b/config/locales/en.yml
index c7d11ee4..186fdc41 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -530,6 +530,8 @@ en:
         feedback: 'This field cannot be empty!'
       uuid:
         label: 'Unique identifier'
+      created_at:
+        label: 'Created at'
       geo:
         uri: 'Open in app'
         osm: 'Open in web map'
diff --git a/config/locales/es.yml b/config/locales/es.yml
index 46e4fc0e..d11ddd8a 100644
--- a/config/locales/es.yml
+++ b/config/locales/es.yml
@@ -538,6 +538,8 @@ es:
         feedback: '¡Este campo no puede estar vacío!'
       uuid:
         label: 'Identificador único'
+      created_at:
+        label: 'Fecha de creación'
       geo:
         uri: 'Abrir en aplicación'
         osm: 'Abrir en mapa web'