In past I use permalinks with date in posts URL’s and finally i go to that point when i see that has no future. Well most of people used to have dates in URL’s because in past that was very popular in permalinks posts about SEO.

…Matt’s recommendation to avoid using dates in your posts URL’s. In that post, I explained how to adjust your permalink structure to remove the dates. Some concerns where then expressed in the comments about making the switch to a permalink URL and the possibility of broken links. This is a legitimate concern for those that rely on old inbound links and search engines for their incoming traffic, so I decided to provide the solution in a new post

What to do when you want to change that and have all links working, even the old one with search engines. Good that WordPress has this amazing plugin for that: 301 Permalink Redirect plugin that make all that magic for us.

You can read about this here: How To Switch Your Post’s Permalink Structure in WordPress.