Hi Sheri, For my clarification, are you looking for Last Active Date? If so, you can use a custom list, Type = User, and add the field Last Active Date. We also have the Usage Report - not sure if you've run one of those from Setup, that has some interesting information. If this isn't what you're looking for, could you tell us a bit more of what you're looking for/to do with Last Activated? Thank you.
-Edwin