I learned a solution from https://stackoverflow.com/questions/36671203/wordpress-publish-date-shortcode
Although it can show the publish in the title, in the source code, it still shows the shortcode [post_published]. That means the search engine will not understand.
For example, assume the title name is "ABC", the result in the front end will show "ABC 2019/05/14", but in the source code it will show "ABC [post_published]", so in the Google search result, the title shows "ABC" only.
How can I do that the title will display the correct title name and publish date? Let it became "ABC 2019/05/14" not "ABC [post_published]"?