diff --git a/CRM/Mailing/DAO/Mailing.php b/CRM/Mailing/DAO/Mailing.php
index 24666f8b5894..1ca7c178abae 100644
--- a/CRM/Mailing/DAO/Mailing.php
+++ b/CRM/Mailing/DAO/Mailing.php
@@ -6,7 +6,7 @@
  *
  * Generated from xml/schema/CRM/Mailing/Mailing.xml
  * DO NOT EDIT.  Generated by CRM_Core_CodeGen
- * (GenCodeChecksum:a2d71da677efc3436ae8ed9414cdecca)
+ * (GenCodeChecksum:4c28acf96d01fa990a3af7f2d72344b5)
  */
 
 /**
@@ -844,7 +844,7 @@ public static function &fields() {
           'description' => ts('Date and time this mailing was created.'),
           'required' => FALSE,
           'where' => 'civicrm_mailing.created_date',
-          'default' => 'NULL',
+          'default' => 'CURRENT_TIMESTAMP',
           'table_name' => 'civicrm_mailing',
           'entity' => 'Mailing',
           'bao' => 'CRM_Mailing_BAO_Mailing',
diff --git a/CRM/Upgrade/Incremental/sql/5.40.alpha1.mysql.tpl b/CRM/Upgrade/Incremental/sql/5.40.alpha1.mysql.tpl
index 6a2df9741d22..3841afccc594 100644
--- a/CRM/Upgrade/Incremental/sql/5.40.alpha1.mysql.tpl
+++ b/CRM/Upgrade/Incremental/sql/5.40.alpha1.mysql.tpl
@@ -10,3 +10,6 @@ UPDATE civicrm_option_value SET name = 'Case'
   WHERE value = 'civicrm_case' AND option_group_id = @option_group_id_tuf;
 UPDATE civicrm_option_value SET name = 'File'
   WHERE value = 'civicrm_file' AND option_group_id = @option_group_id_tuf;
+
+ALTER TABLE civicrm_mailing
+MODIFY COLUMN `created_date` timestamp NULL DEFAULT CURRENT_TIMESTAMP COMMENT 'Date and time this mailing was created.';
diff --git a/Civi/Core/Container.php b/Civi/Core/Container.php
index 0632c649c440..72e69c4762d1 100644
--- a/Civi/Core/Container.php
+++ b/Civi/Core/Container.php
@@ -285,11 +285,6 @@ public function createContainer() {
     $container->setDefinition('cache_config', new Definition('ArrayObject'))
       ->setFactory([new Reference(self::SELF), 'createCacheConfig'])->setPublic(TRUE);
 
-    $container->setDefinition('civi.mailing.triggers', new Definition(
-      'Civi\Core\SqlTrigger\TimestampTriggers',
-      ['civicrm_mailing', 'Mailing']
-    ))->addTag('kernel.event_listener', ['event' => 'hook_civicrm_triggerInfo', 'method' => 'onTriggerInfo'])->setPublic(TRUE);
-
     $container->setDefinition('civi.activity.triggers', new Definition(
       'Civi\Core\SqlTrigger\TimestampTriggers',
       ['civicrm_activity', 'Activity']
diff --git a/xml/schema/Mailing/Mailing.xml b/xml/schema/Mailing/Mailing.xml
index ca0dee584aa6..c5e65fe046cd 100644
--- a/xml/schema/Mailing/Mailing.xml
+++ b/xml/schema/Mailing/Mailing.xml
@@ -325,7 +325,7 @@
   <field>
     <name>created_date</name>
     <type>timestamp</type>
-    <default>NULL</default>
+    <default>CURRENT_TIMESTAMP</default>
     <required>false</required>
     <title>Mailing Created Date</title>
     <comment>Date and time this mailing was created.</comment>