Ono Oogami

This little plugin allow customing the “date base” of date (month, year, day, etc.) archive page. For example, by default your blog’s monthly archive page’s permalink is like: “http://example.com/date/2010/05/”, with this plugin you can change the string “date” to others, just like the feature of changing permalink’s category base and tag base which is built in WordPress.
Note if your blog’s permalink structure is “/YYYY/mm/dd/post-slug/”, this plugin will not take effect and your blog’s permalink of date archive page would be “/YYYY/mm/”.

Date Permalink Base

Allow customing date base of archive page permalink .

Svetoslav Marinov

orbisius

If you have an existing website and you want to add category to your blog posts links (e.g. by using: /%category%/%postname%/ in Settings > Permalinks) then your visitors 
will most likely run into page not found errors. This plugin checks for such post links and redirects the visitor using permanent (301) redirect to the correct /Category/Permalink link IF the permalinks are setup.
This plugin assumes that you have previously used /%postname%/ in your Settings > Permalinks.
Demo 
http://www.youtube.com/watch?v=L124jV5joTk
Bugs? Suggestions? If you want a faster reponse contact us through our website’s contact form [ orbisius.com ] and not through the support tab of this plugin or WordPress forums. 
We don’t get notified when such requests get posted in the forums.
<a href="http://orbisius.com/go/intro2site?permalinks-to-categorypermalinks" rel="nofollow ugc">Free e-book: How to Build a Website Using WordPress: Beginners Guide</a>
<h4>Author</h4>
Svetoslav Marinov (Slavi) | <a href="http://orbisius.com" title="Custom Web Programming, Web Design, e-commerce, e-store, WordPress Plugin Development, Facebook and Mobile App Development in Niagara Falls, St. Catharines, Ontario, Canada" rel="nofollow ugc">Custom Web and Mobile Programming by Orbisius.com</a>

Permalinks to Category/Permalinks

While it may seem trivial, switching from permalinks to a prefix using a category is tough. Slavi's plugin works just as expected and works out of the box. Definitely recommended.

Works as expected, thanks!

The plugin automatically redirects users who have accessed a blog post link without the category to the one which has the category and therefore avoid …

Date Permalink Base vs Permalinks to Category/Permalinks