If I haven't?if you use zfs try
How to know when FreeBSD system was installed?
For example:
But I remember that my system was installed in July, not earlier.Bash:# stat -f '%SB %N' / May 12 11:33:00 2022 / #
% ls -lrt /etc | less
vovas@tank:~ $ stat -x /home
File: "/home"
Size: 8 FileType: Symbolic Link
Mode: (0755/lrwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ wheel)
Device: 1707236475,1254490208 Inode: 18782 Links: 1
Access: Fri Jul 15 21:22:09 2022
Modify: Fri Jul 15 21:22:09 2022
Change: Fri Jul 15 21:22:09 2022
Birth: Fri Jul 15 21:22:09 2022
It's not correct wayor you can list /etc in time order to see the first date after the build date
vovas@tank:~ $ ls -lrt /etc | less
total 520
drwxr-xr-x 2 root wheel 2 May 12 2022 rc.conf.d
drwxr-xr-x 6 root wheel 6 May 12 2022 periodic
drwxr-xr-x 2 root wheel 2 May 12 2022 jail.conf.d
// edit:
As VladiBG says,
//
/var/log/bsdinstall_log is likely the first new file written, or you can list /etc in time order to see the first date after the build date:
% ls -lrt /etc | less
It's not correct way
If you check when 13.1-RELEASE was upload to download access, you'll see same date. It's not date of installation on your server/pc. It's looks like date of birth 13.1-RELEASECode:vovas@tank:~ $ ls -lrt /etc | less total 520 drwxr-xr-x 2 root wheel 2 May 12 2022 rc.conf.d drwxr-xr-x 6 root wheel 6 May 12 2022 periodic drwxr-xr-x 2 root wheel 2 May 12 2022 jail.conf.d