If I needed to find this out I would use either datafeeds or data warehouse in combination with SQL, however if you are looking for something inside of Adobe analytics UI then you would need to create an Evar using a timestamp getdate and subtracting the number of days since last visit.
Yes, that's exactly what I meant - specific date for each visitor. Both of your solutions make sense, thank you. I was convinced that there was a way to build a segment and a metric, but I just could not see it.
There is no default metric/ Dimension that will tell about the date of the last visit per user. However, you would be able to find a dimension in workspace with the name as Days since last visit and you can apply Unique visitor metric. That might can help.