diff --git a/publication_date.module b/publication_date.module
index 7546a24..9404702 100755
--- a/publication_date.module
+++ b/publication_date.module
@@ -5,6 +5,8 @@
  * Add a field to nodes containing the publication date.
  */
 
+use Drupal\Core\Field\BaseFieldDefinition;
+
 /**
  * Define the value stored in the database when a node is unpublished and no
  * publication date has been set. We use the largest number that the database
@@ -26,7 +28,7 @@ function publication_date_entity_base_field_info(\Drupal\Core\Entity\EntityTypeI
   $fields = [];
 
   if ($entity_type->id() == 'node') {
-    $fields['published_at'] = \Drupal\Core\Field\BaseFieldDefinition::create('published_at')
+    $fields['published_at'] = BaseFieldDefinition::create('published_at')
       ->setLabel(t('Published on'))
       ->setDescription(t('Keep the publication timestamp for each node.'))
       ->setRevisionable(TRUE)
@@ -36,6 +38,7 @@ function publication_date_entity_base_field_info(\Drupal\Core\Entity\EntityTypeI
         'type' => 'timestamp',
         'weight' => 0,
       ))
+      ->setDisplayConfigurable('view', TRUE)
       ->setDisplayOptions('form', array(
         'type' => 'datetime_timestamp',
         'weight' => 10,
@@ -47,39 +50,6 @@ function publication_date_entity_base_field_info(\Drupal\Core\Entity\EntityTypeI
 }
 
 /**
- * Implements hook_ENTITY_TYPE_presave().
- *
- * @param \Drupal\node\NodeInterface $node
- */
-function publication_date_node_presave(\Drupal\node\NodeInterface $node) {
-  // If a publication date has already been set then retain it.
-  if (!empty($node->published_at->value)) {
-    $published_at = $node->published_at->value;
-  }
-  // Otherwise, if no publication date has been set and the node is published
-  // then set the publication date to REQUEST_TIME.
-  elseif ($node->isPublished()) {
-    $published_at = REQUEST_TIME;
-  }
-  // Otherwise, if no publication date has been set and the node is unpublished
-  // then store the default publication date.
-  else {
-    $published_at = PUBLICATION_DATE_DEFAULT;
-  }
-
-  // Allow other modules to alter the publication date before it is saved.
-  $data = [
-    'published_at' => $published_at,
-    'node' => $node,
-    'op' => $node->isNew() ? 'insert' : 'update'
-  ];
-  \Drupal::moduleHandler()->alter('publication_date', $data);
-
-  // Update the node object.
-  $node->set('published_at', $published_at);
-}
-
-/**
  * Implements hook_form_BASE_ID_alter().
  *
  * Display the publication date on the node edit form.
@@ -108,17 +78,9 @@ function publication_date_clone_node_alter(&$node, $context) {
 }
 
 /**
- * Implements hook_menu().
+ * Implements hook_field_formatter_info_alter().
  */
-function publication_date_menu() {
-  $items['admin/config/content/publication-date'] = array(
-    'title' => 'Publication date',
-    'description' => 'Configure publication date settings when using the date popup module.',
-    'page callback' => 'drupal_get_form',
-    'page arguments' => array('publication_date_admin_form'),
-    'access arguments' => array('administer publication date'),
-    'file' => 'includes/publication_date.admin.inc',
-  );
-
-  return $items;
+function publication_date_field_formatter_info_alter(array &$info) {
+  $info['timestamp']['field_types'][] = 'published_at';
+  $info['timestamp_ago']['field_types'][] = 'published_at';
 }
diff --git a/src/Plugin/Field/FieldType/PublicationDateItem.php b/src/Plugin/Field/FieldType/PublicationDateItem.php
index 5a0a919..ce3d5e9 100644
--- a/src/Plugin/Field/FieldType/PublicationDateItem.php
+++ b/src/Plugin/Field/FieldType/PublicationDateItem.php
@@ -84,10 +84,7 @@ class PublicationDateItem extends ChangedItem {
    * @inheritDoc
    */
   public function isEmpty() {
-    if (isset($this->value) || isset($this->published_at_or_now)) {
-      return FALSE;
-    }
-    return TRUE;
+    return FALSE;
   }
 
 }