Finding the date on which a Fedora 23 was installed on a given machine

[Andrew R Paterson]

On Saturday 16 Jan 2016 02:19:59 Tim wrote:
> On Fri, 2016-01-15 at 10:34 +0000, Christopher Ross wrote:
> > # rpm -qi fedora-release
> 
> Occasionally, even *that* package gets updated, so it's not an indicator
> of install time.  Unless someone else knows of something intended to show
> you the installation date, you are better off looking for some files in
> the /root directory that get created as part of the installation routine.
> 
> e.g. Inside my /root:
> 
> -rw-------. 1 root root     1227 Apr 23  2014 anaconda-ks.cfg
> -rw-r--r--. 1 root root     1244 Apr 24  2014 initial-setup-ks.cfg
> 
> But, rpm -qi fedora-release:
> 
> Name        : fedora-release
> Version     : 20
> Release     : 4
> Architecture: noarch
> Install Date: Tue 26 May 2015 03:08:20 ACST
> 
> And, rpm -q --changelog fedora-release:
> 
> * Thu May 14 2015 Dennis Gilmore <dennis at ausil.us> - 20-4
> - add the Fedora 22 gpg keys rhbz#1220358
> 
> * Wed Feb 19 2014 Dennis Gilmore <dennis at ausil.us> - 20-3
> - bump for downstream breakage
> 
> * Wed Feb 19 2014 Dennis Gilmore <dennis at ausil.us> - 20-2
> - provide system-release(%version) rhbz#1047058
> 
> * Wed Nov 27 2013 Dennis Gilmore <dennis at ausil.us> - 20-1
> - enabled metadata caching for fedora
> - disable updates-testing
> - obsolete fedora-release-rawhide < the last shipped rawhide build
> 
> * Wed Nov 13 2013 Dennis Gilmore <dennis at ausil.us> - 20-0.8
> - patch from Will Woods to use a archmap file for linking gpg keys
> - add f21 keys
> - add fields to /etc/os-release for rhbz#951119
> - set skip_if_unavailable=False for rhbz#985354
> 
> * Tue Sep 03 2013 Dennis Gilmore <dennis at ausil.us> - 20-0.7
> - set Fedora 20 release name
> 
> * Fri Aug 30 2013 Dennis Gilmore <dennis at ausil.us> - 20-0.6
> - update the fedora 20 secondary arch key it had been created
> incorrectly
> 
> * Tue Aug 20 2013 Dennis Gilmore <dennis at ausil.us> - 20-0.5
> - disable rawhide
> - enable fedora, updates and updates-testing
> - disable 7d metadata cache for fedora
> - Obsolete older fedora-release-rawhide
> 
> * Wed Jul 31 2013 Dennis Gilmore <dennis at ausil.us> - 20-0.4
> - link armhfp gpg key to primary since its now living there
> 
> * Mon Jul 08 2013 Dennis Gilmore <dennis at ausil.us> - 20-0.3
> - fix up typo
> 
> * Wed Jun 19 2013 Dennis Gilmore <dennis at ausil.us> - 20-0.2
> - add f20 keys
> - switch mirrorlist= to metalink= bz#948788
> - add bugzilla fields to os-release for brokeness in abrt bz#961477
> - add releasever into gpgkey paths
> - use consistent macros for dist_release value
> 
> * Tue Mar 12 2013 Dennis Gilmore <dennis at ausil.us> - 20-0.1
> - setup for f20
> - 64 bit arm arch is aarch64 not arm64
> - drop sparc arches
> 
>  --- snip ---
> 
> Obviously most of that is pre-release, but some of it is post.

How about the creation date of /etc/redhat-release
Works for me!
Regards
Andy