how to find when/time gentoo was installed

[asiobob]

is there a command to check when the curent OS installation was installed?

[moocha]

Nope, but you could look at the first line of /var/log/emerge.log (assuming you didn't make the mistake of deleting/truncating it).
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[mhodak]

You can also do "last | tail" which gives you first logins into your system.

[ett_gramse_nap]