Magento Enterprise Edition allows you to log specific actions a user performs within the Magento Administration Panel as standard. Unfortunately, Magento Community Edition does not provide this feature, but you can easily view the last time a user logged in by querying the database directly.
The easiest way to view the information is through phpMyAdmin, a web-application that is usually offered by most hosting companies which allows you to administrate a MySQL database directly on the web.
Simply login to phpMyAdmin, select your Magento database and then select the ‘admin_user’ table within the left hand sidebar. A list of current administrative users will be outlined on the screen, the ‘logdate’ field will reveal the time the user successfully logged in to the Magento Administration Panel.
Alternatively, if you do not have phpMyAdmin access you can query the database directly by making use of the following MySQL query.
SELECT username AS USERNAME, logdate AS LOGIN_DATE
WHERE username = “enter-user-here”;
I hope that helps to answer your query.