Addon that tracks the last time I logged into a character
 

https://www.curseforge.com/wow/addons/auction-watch This looked promising for what I was trying to do but it doesn't work. I just need a simple interface that tracks every alt I log into and shows when the last time was that they were online.

This addon records when characters log on .. but sounds like it is used for keeping track of other peoples alts but I would suppose that there is a way to limit it to just you the player.

https://www.wowinterface.com/downloa...4950-Alts.html