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-- From 4.0.0-2018-08-01.sql ALTER TABLE `#__ucm_content` MODIFY `core_created_time` datetime NOT NULL; ALTER TABLE `#__ucm_content` MODIFY `core_modified_time` datetime NOT NULL; ALTER TABLE `#__ucm_content` MODIFY `core_publish_up` datetime NULL DEFAULT NULL; ALTER TABLE `#__ucm_content` MODIFY `core_publish_down` datetime NULL DEFAULT NULL; -- Only on MySQL: Update empty strings to null date before converting the column from varchar to datetime UPDATE `#__ucm_content` SET `core_checked_out_time` = '0000-00-00 00:00:00' WHERE `core_checked_out_time` = ''; ALTER TABLE `#__ucm_content` MODIFY `core_checked_out_time` datetime NULL DEFAULT NULL; -- From 4.0.0-2018-08-29.sql ALTER TABLE `#__modules` MODIFY `publish_up` datetime NULL DEFAULT NULL; ALTER TABLE `#__modules` MODIFY `publish_down` datetime NULL DEFAULT NULL; ALTER TABLE `#__modules` MODIFY `checked_out_time` datetime NULL DEFAULT NULL; -- Use 0 instead of '0000-00-00 00:00:00' if you get 'Invalid default value for ...' UPDATE `#__modules` SET `publish_up` = NULL WHERE `publish_up` = '0000-00-00 00:00:00'; UPDATE `#__modules` SET `publish_down` = NULL WHERE `publish_down` = '0000-00-00 00:00:00'; UPDATE `#__modules` SET `checked_out_time` = NULL WHERE `checked_out_time` = '0000-00-00 00:00:00';