Is there any way to exclude the date for new post only?

  blogs, javascript, php, wordpress, wordpress-theming

I have WordPress website. I have one question for WordPress blog

I know how to change the URL setting for blog posts so that the date is not included. What I don’t know is how to make that change for new posts only. Is there a way to change the URL structure to exclude the date for new posts only?

Source: Ask Javascript Questions