Find OpenBSD install date
2023-01-27T09:01:38Z
As suggested on twtxt, one may look at filesystem creation time to get a good approximation of system install date.
Here how I did it. There may be better methods, so let me know :)
I use /usr/src slice as reference, probably unused, or reboot in single mode with "> boot -s" to use another slice.
mount | awk '/usr\/src/ {print $1} # find device, return sd0i for me
umount /usr/src # not used right now
dumpfs sd0i |\ # get time data, look at lowest
awk '/time/ {print $6, $7, $8, $9, $10}' |\
sort -u
mount /usr/src # mount back