last simply shows who has recently used certain files and | or logged in-out.
More reliable result may be obtained by asking tune2fs "When my file system was created?" with the command:
sudo tune2fs -l /dev/sdXnn | grep -i created
where Xnn is a1, a2,.. a99, b1, b2,.. b99, c1, c2,..
It works only when a filesystem, once created, has never been moved or otherwise re-created.
I frequently move my systems between various partitions, using backup-restore with FSArchiver. During restore, it allows to create a filesystem in destination partition from scratch.
I have a few Arch systems installed in 2008. When I backup and then restore them, their original creation date is lost - it gets the "restore date" value.
