How can we report on Users Last Login Date and Time?

Summary:

We often has scenarios where workers are terminated in the system after their actual finish date. This means that there is a window where users can access our systems after their termination date. We need to be able to report on the last time they logged in to determine if there was a risk or not.

Content (please ensure you mask any confidential information):

Using the User System Usage subject area, there are fields (shown below) retrieving data but what impacts the results? They don't appear to be limited to the Users System Usage:

Last Activity Date

Last Update Date