CodeCave

CodeCave Admin Security Auditor is a lightweight plugin that helps you monitor user activity by tracking and displaying the last login time for each user in your WordPress site.
Features:
<ul>
<li>Automatically tracks the last login time for all users</li>
<li>Displays last login information in the WordPress admin users table</li>
<li>Sortable last login column for easy user management</li>
<li>Shows “Never” for users who haven’t logged in since plugin installation</li>
<li>Timezone-aware display (uses your WordPress timezone settings)</li>
<li>Clean uninstall – removes all data when plugin is deleted</li>
<li>Translation ready</li>
<li>No configuration needed – works out of the box</li>
</ul>
Use Cases:
<ul>
<li>Monitor user engagement and activity</li>
<li>Identify inactive user accounts</li>
<li>Security auditing and compliance</li>
<li>User account cleanup and maintenance</li>
<li>Track user adoption of your WordPress site</li>
</ul>
Privacy and Data:
This plugin stores the last login timestamp as user metadata in your WordPress database. No data is sent to external servers. When you uninstall the plugin, all stored data is automatically removed.
<h3>Developer Notes</h3>
Accessing Last Login Data Programmatically:
You can retrieve the last login timestamp for a user:
<pre><code>$auditor = CodeCave_Admin_Security_Auditor::get_instance();
$last_login = $auditor->get_last_login( $user_id );

if ( $last_login ) {
 echo 'Last login: ' . date( 'Y-m-d H:i:s', $last_login );
} else {
 echo 'Never logged in';
}
</code></pre>
Hooks and Filters:
The plugin uses standard WordPress hooks and does not currently provide custom hooks. This may be added in future versions based on user feedback.

CodeCave Admin Security Auditor

Track and display the last login time for each user in the WordPress admin users table.

Patrick Chia

This is very simple plugin to provides information about the last login activity on you blog account, If you’re concerned about unauthorized access to your blog account, you’ll be able to use this information to find out if and when someone gained access. 
The IP address is also useful. If you always or most often sign in to your blog account using a single computer, your IP address should be the same, or start with the same two sets of numbers (for example, 125.16.xx.xx). If you’re seeing an IP address that differs greatly from your usual IP address, it could either mean that you’ve recently accessed your account from a different location, or that someone has accessed your blog.

WordPress Last Login

This feature provides information about the last login activity on your blog account and any concurrent activity.

CodeCave Admin Security Auditor vs WordPress Last Login