I removed the date from the URL of my post links. I’m programming 301 redirect code for that. Meanwhile, just in case you faced any issue, remove the date yourself please:
Visit your settings if you want to change your Permalinks.
Unless your blog is new, or you’re fully aware of what you’re doing, I don’t totally recommend this. There will be a mess on search engines (temporary) and other linked sites. However, things when you’re on WordPress Business Plan or Self-hosted WordPress are easy as you can edit your htaccess file or using plugins for 301 redirect.
Have you ever changed the permalinks of your blog? What is your best URL structure?