JohnnyPea

This plugin adds registration date and last login date columns on the “Users” page. 
It also checks whether user logs in within 30 days after the registration if he does not his account is deleted – this option is disabled by default, you can change this settings on Check Last Login Settings page in Settings menu.
WARNING! The plugin is not updating the login time when logging through stored login cookies.
I am open to suggestions to improve the plugin !

Check Last Login

Simple plugin which checks user's login status and displays registration date and last login date columns on the "Users" page.

Carlos Martínez Romero

“Show User Registration Date” is a small plugin that displays the user registered date in the table of the users section in the WordPress dashboard. It will be added as a column with the other data of each user.
<h3>Features</h3>
<ul>
<li>Displays the user registered date at Users table</li>
</ul>

Show User Registration Date

If you want to know when the users were registered in your website this is the perfect plugin for you :)

Works as expected

This plugin shows the registed date field in the table of the Users section in the WordPress dashboard.

Check Last Login vs Show User Registration Date