Fix the `invalid default value for 'post_date'` Error in WordPress MySQL

CMS WordPress
1 
SET SQL_MODE = '';
ALTER TABLE `wp_posts` CHANGE `post_date` `post_date` DATETIME  NOT NULL  DEFAULT '1970-01-01 00:00:00';
ALTER TABLE `wp_posts` CHANGE `post_date_gmt` `post_date_gmt` DATETIME  NOT NULL  DEFAULT '1970-01-01 00:00:00';
ALTER TABLE `wp_posts` CHANGE `post_modified` `post_modified` DATETIME  NOT NULL  DEFAULT '1970-01-01 00:00:00';
ALTER TABLE `wp_posts` CHANGE `post_modified_gmt` `post_modified_gmt` DATETIME  NOT NULL  DEFAULT '1970-01-01 00:00:00';
2

Do I need to add a command to restore strict SQL mode at the end of the executed statement?

3

No need, it only takes effect during the session.