diff --git a/administrator/components/com_admin/sql/updates/mysql/4.0.0-2019-06-29.sql b/administrator/components/com_admin/sql/updates/mysql/4.0.0-2019-06-29.sql
index 36a43fcb382c1..d7c5e1e0d9e9d 100644
--- a/administrator/components/com_admin/sql/updates/mysql/4.0.0-2019-06-29.sql
+++ b/administrator/components/com_admin/sql/updates/mysql/4.0.0-2019-06-29.sql
@@ -1,7 +1,26 @@
+ALTER TABLE `#__newsfeeds` MODIFY `created` datetime NOT NULL;
+ALTER TABLE `#__newsfeeds` MODIFY `modified` datetime NOT NULL;
+
 ALTER TABLE `#__newsfeeds` MODIFY `publish_up` datetime NULL DEFAULT NULL;
 ALTER TABLE `#__newsfeeds` MODIFY `publish_down` datetime NULL DEFAULT NULL;
 ALTER TABLE `#__newsfeeds` MODIFY `checked_out_time` datetime NULL DEFAULT NULL;
 
+UPDATE `#__newsfeeds` SET `modified` = `created` WHERE `modified` = '0000-00-00 00:00:00';
+
 UPDATE `#__newsfeeds` SET `publish_up` = NULL WHERE `publish_up` = '0000-00-00 00:00:00';
 UPDATE `#__newsfeeds` SET `publish_down` = NULL WHERE `publish_down` = '0000-00-00 00:00:00';
 UPDATE `#__newsfeeds` SET `checked_out_time` = NULL WHERE `checked_out_time` = '0000-00-00 00:00:00';
+
+UPDATE `#__ucm_content` SET `core_modified_time` = `core_created_time`
+ WHERE `core_type_alias` = 'com_newsfeeds.newsfeed'
+   AND `core_modified_time` = '0000-00-00 00:00:00';
+
+UPDATE `#__ucm_content` SET `core_publish_up` = NULL
+ WHERE `core_type_alias` = 'com_newsfeeds.newsfeed'
+   AND `core_publish_up` = '0000-00-00 00:00:00';
+UPDATE `#__ucm_content` SET `core_publish_down` = NULL
+ WHERE `core_type_alias` = 'com_newsfeeds.newsfeed'
+   AND `core_publish_down` = '0000-00-00 00:00:00';
+UPDATE `#__ucm_content` SET `core_checked_out_time` = NULL
+ WHERE `core_type_alias` = 'com_newsfeeds.newsfeed'
+   AND `core_checked_out_time` = '0000-00-00 00:00:00';
diff --git a/administrator/components/com_admin/sql/updates/postgresql/4.0.0-2019-06-29.sql b/administrator/components/com_admin/sql/updates/postgresql/4.0.0-2019-06-29.sql
index bf1f50f89fa6c..df9bb2c27d00c 100644
--- a/administrator/components/com_admin/sql/updates/postgresql/4.0.0-2019-06-29.sql
+++ b/administrator/components/com_admin/sql/updates/postgresql/4.0.0-2019-06-29.sql
@@ -1,3 +1,7 @@
+ALTER TABLE "#__newsfeeds" ALTER COLUMN "created" DROP DEFAULT;
+
+ALTER TABLE "#__newsfeeds" ALTER COLUMN "modified" DROP DEFAULT;
+
 ALTER TABLE "#__newsfeeds" ALTER COLUMN "publish_up" DROP NOT NULL;
 ALTER TABLE "#__newsfeeds" ALTER COLUMN "publish_up" DROP DEFAULT;
 
@@ -7,6 +11,22 @@ ALTER TABLE "#__newsfeeds" ALTER COLUMN "publish_down" DROP DEFAULT;
 ALTER TABLE "#__newsfeeds" ALTER COLUMN "checked_out_time" DROP NOT NULL;
 ALTER TABLE "#__newsfeeds" ALTER COLUMN "checked_out_time" DROP DEFAULT;
 
+UPDATE "#__newsfeeds" SET "modified" = "created" WHERE "modified" = '1970-01-01 00:00:00';
+
 UPDATE "#__newsfeeds" SET "publish_up" = NULL WHERE "publish_up" = '1970-01-01 00:00:00';
 UPDATE "#__newsfeeds" SET "publish_down" = NULL WHERE "publish_down" = '1970-01-01 00:00:00';
 UPDATE "#__newsfeeds" SET "checked_out_time" = NULL WHERE "checked_out_time" = '1970-01-01 00:00:00';
+
+UPDATE "#__ucm_content" SET "core_modified_time" = "core_created_time"
+ WHERE "core_type_alias" = 'com_newsfeeds.newsfeed'
+   AND "core_modified_time" = '1970-01-01 00:00:00';
+
+UPDATE "#__ucm_content" SET "core_publish_up" = NULL
+ WHERE "core_type_alias" = 'com_newsfeeds.newsfeed'
+   AND "core_publish_up" = '1970-01-01 00:00:00';
+UPDATE "#__ucm_content" SET "core_publish_down" = NULL
+ WHERE "core_type_alias" = 'com_newsfeeds.newsfeed'
+   AND "core_publish_down" = '1970-01-01 00:00:00';
+UPDATE "#__ucm_content" SET "core_checked_out_time" = NULL
+ WHERE "core_type_alias" = 'com_newsfeeds.newsfeed'
+   AND "core_checked_out_time" = '1970-01-01 00:00:00';
diff --git a/administrator/components/com_newsfeeds/sql/install.mysql.utf8.sql b/administrator/components/com_newsfeeds/sql/install.mysql.utf8.sql
index 11df5f72df791..efa5072feb61e 100644
--- a/administrator/components/com_newsfeeds/sql/install.mysql.utf8.sql
+++ b/administrator/components/com_newsfeeds/sql/install.mysql.utf8.sql
@@ -12,22 +12,22 @@ CREATE TABLE IF NOT EXISTS `#__newsfeeds` (
   `numarticles` int(10) unsigned NOT NULL DEFAULT 1,
   `cache_time` int(10) unsigned NOT NULL DEFAULT 3600,
   `checked_out` int(10) unsigned NOT NULL DEFAULT 0,
-  `checked_out_time` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
+  `checked_out_time` datetime,
   `ordering` int(11) NOT NULL DEFAULT 0,
   `rtl` tinyint(4) NOT NULL DEFAULT 0,
   `access` int(10) unsigned NOT NULL DEFAULT 0,
   `language` char(7) NOT NULL DEFAULT '',
   `params` text NOT NULL,
-  `created` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
+  `created` datetime NOT NULL,
   `created_by` int(10) unsigned NOT NULL DEFAULT 0,
   `created_by_alias` varchar(255) NOT NULL DEFAULT '',
-  `modified` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
+  `modified` datetime NOT NULL,
   `modified_by` int(10) unsigned NOT NULL DEFAULT 0,
   `metakey` text NOT NULL,
   `metadesc` text NOT NULL,
   `metadata` text NOT NULL,
-  `publish_up` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
-  `publish_down` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
+  `publish_up` datetime,
+  `publish_down` datetime,
   `description` text NOT NULL,
   `version` int(10) unsigned NOT NULL DEFAULT 1,
   `hits` int(10) unsigned NOT NULL DEFAULT 0,
diff --git a/components/com_newsfeeds/Model/CategoryModel.php b/components/com_newsfeeds/Model/CategoryModel.php
index a0be4b3b44c05..e45e26bc4a099 100644
--- a/components/com_newsfeeds/Model/CategoryModel.php
+++ b/components/com_newsfeeds/Model/CategoryModel.php
@@ -181,8 +181,8 @@ protected function getListQuery()
 
 		if ($this->getState('filter.publish_date'))
 		{
-			$query->where('(' . $query->isNullDatetime('a.publish_up') . ' OR a.publish_up <= ' . $db->quote($nowDate) . ')')
-				->where('(' . $query->isNullDatetime('a.publish_down') . ' OR a.publish_down >= ' . $db->quote($nowDate) . ')');
+			$query->where('(a.publish_up IS NULL OR a.publish_up <= ' . $db->quote($nowDate) . ')')
+				->where('(a.publish_down IS NULL OR a.publish_down >= ' . $db->quote($nowDate) . ')');
 		}
 
 		// Filter by search in title
diff --git a/components/com_newsfeeds/Model/NewsfeedModel.php b/components/com_newsfeeds/Model/NewsfeedModel.php
index 9b0ca782731c9..eac112b932cf7 100644
--- a/components/com_newsfeeds/Model/NewsfeedModel.php
+++ b/components/com_newsfeeds/Model/NewsfeedModel.php
@@ -115,8 +115,8 @@ public function &getItem($pk = null)
 				if (is_numeric($published))
 				{
 					$query->where('(a.published = ' . (int) $published . ' OR a.published =' . (int) $archived . ')')
-						->where('(' . $query->isNullDatetime('a.publish_up') . ' OR a.publish_up <= ' . $db->quote($nowDate) . ')')
-						->where('(' . $query->isNullDatetime('a.publish_down') . ' OR a.publish_down >= ' . $db->quote($nowDate) . ')')
+						->where('(a.publish_up IS NULL OR a.publish_up <= ' . $db->quote($nowDate) . ')')
+						->where('(a.publish_down IS NULL OR a.publish_down >= ' . $db->quote($nowDate) . ')')
 						->where('(c.published = ' . (int) $published . ' OR c.published =' . (int) $archived . ')');
 				}
 
diff --git a/installation/sql/mysql/joomla.sql b/installation/sql/mysql/joomla.sql
index e578254b42070..3afe20052d82e 100644
--- a/installation/sql/mysql/joomla.sql
+++ b/installation/sql/mysql/joomla.sql
@@ -1567,10 +1567,10 @@ CREATE TABLE IF NOT EXISTS `#__newsfeeds` (
   `access` int(10) unsigned NOT NULL DEFAULT 0,
   `language` char(7) NOT NULL DEFAULT '',
   `params` text NOT NULL,
-  `created` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
+  `created` datetime NOT NULL,
   `created_by` int(10) unsigned NOT NULL DEFAULT 0,
   `created_by_alias` varchar(255) NOT NULL DEFAULT '',
-  `modified` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
+  `modified` datetime NOT NULL,
   `modified_by` int(10) unsigned NOT NULL DEFAULT 0,
   `metakey` text NOT NULL,
   `metadesc` text NOT NULL,
diff --git a/installation/sql/postgresql/joomla.sql b/installation/sql/postgresql/joomla.sql
index 1653726dd3678..a5d32908ba5e6 100644
--- a/installation/sql/postgresql/joomla.sql
+++ b/installation/sql/postgresql/joomla.sql
@@ -1564,10 +1564,10 @@ CREATE TABLE IF NOT EXISTS "#__newsfeeds" (
   "access" bigint DEFAULT 0 NOT NULL,
   "language" varchar(7) DEFAULT '' NOT NULL,
   "params" text NOT NULL,
-  "created" timestamp without time zone DEFAULT '1970-01-01 00:00:00' NOT NULL,
+  "created" timestamp without time zone NOT NULL,
   "created_by" integer DEFAULT 0 NOT NULL,
   "created_by_alias" varchar(255) DEFAULT '' NOT NULL,
-  "modified" timestamp without time zone DEFAULT '1970-01-01 00:00:00' NOT NULL,
+  "modified" timestamp without time zone NOT NULL,
   "modified_by" integer DEFAULT 0 NOT NULL,
   "metakey" text NOT NULL,
   "metadesc" text NOT NULL,