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When was a linux OS installed?

By mistake I found out how one can discover when his linux OS was installed, well..in most of the cases. Previously I had no idea how to do this and not even this may be the best idea (if you know other ways to do this, let me know):
dumpe2fs -h /your/root/partition|grep created

The command will show when the filesystem was created initially, but if we ask for the / or /boot fs information, then this should be the install date.
E.g.:
sudo dumpe2fs -h /dev/sda2|grep created
dumpe2fs 1.41.12 (17-May-2010)
Filesystem created:       Thu Dec  9 21:34:06 2010

Voila!