Extension:LastUserLogin

The LastUserLogin extension introduces a special page that displays a simple table of users and the last time they logged in. This can be useful if your wiki is used as a knowledge base for outside personnel. If you have a requirement that they check the wiki prior to placing a call or email, LastUserLogin can be used to verify that this policy is being enforced.

Usage
Once installed, visit Special:LastUserLogin to see the times at which each user last logged in. This extension introduces the 'lastlogin' right which is needed to view the special page, and by default is only granted to admins (sysops).

Compatibility with removeUnusedAccounts.php
Adding a log entry for every user login impacts the script maintenance/removeUnusedAccounts.php as the script checks for the number of page-edits, image-uploads and log-entries. However you can patch removeUnusedAccounts.php to ignore the first login which is very common for spam bots:

Original: Change to: