I thought it might be hidden somewhere!
First installation date perhaps? I believe I read somewhere something about that!
I found it:
[limo@limo ~]$ stat / | awk '/Birth: /{print $2}'
2022-07-09
Thatās the date when the root directory was created. Itās usually the date of install, but not necessarily. In general, there is no reliable way to tell when the OS was installed, but things like that give you a good guess most of the time.
But even so, the ISO names like āArtemisā are pointless when you have the installed system, because itās a rolling release. They make sense only for the ISOs.
Thatās a good start.
I found as well:
ls -lact --full-time /etc |tail
-rw-r--r-- 1 root root 1634 2022-07-09 17:19:01.189930011 +0200 rpc
-rw-r--r-- 1 root root 0 2022-07-09 17:19:01.183263325 +0200 arch-release
-rw-r--r-- 1 root root 73 2022-07-09 17:19:01.183263325 +0200 host.conf
-rw-r--r-- 1 root root 117 2022-07-09 17:19:01.183263325 +0200 ld.so.conf
lrwxrwxrwx 1 root root 19 2022-07-09 17:19:01.183263325 +0200 mtab -> ../proc/self/mounts
-rw-r--r-- 1 root root 359 2022-07-09 17:19:01.183263325 +0200 nsswitch.conf
-rw-r--r-- 1 root root 1020 2022-07-09 17:19:01.183263325 +0200 profile
-rw-r--r-- 1 root root 139 2022-07-09 17:19:01.183263325 +0200 securetty
-rw-r--r-- 1 root root 298782 2022-07-09 17:19:01.169929955 +0200 services
-rw-r--r-- 1 root root 3171 2022-07-09 17:19:01.166596612 +0200 protocols
[limo@limo ~]$
So whatās your point?
POSIX filesystems typically do not keep the created time for files, only modified and accessed. These dates can be changed with a simple touch command.
In any case, there is no guarantee that this time is the when you installed your system.
I can know when my system was installed then from https://endeavouros.com/news/ I can know a bit more.
It is nothing muchā¦ just learning!
Knowing when root directory was created is ok.
What do EndeavourOS news have to do with the exact time youāve installed your system? 
What are you trying to accomplish?
I find pacman.log to be a reliable indicator of the install date, because it does not rely on filesystem attributes and is only appended.
I can figure out which release I started with.
I could figure out we had Atlantis (8 months ago), then Apollo (April 8 2022) then Artemisā¦
Yeah, it literally tells you when the system was installed. The problem is, it is not universaly reliable, because the user might have deleted it.
But why is that important? I told you above that it doesnāt matter from which ISO youāve installed your system, as long as youāre updating it regularly. The problem with old ISOs is that itās difficult to update them, thatās the main reason new ISOs are released.
But even with old ISOs, if you do an online install, you should end up with an updated EndeavourOS installation.
You see, when you do an online install, youāre downloading packages from Arch repos. The same packages I am downloading when I update my system. So you end up at the same version of the system regardless of the ISO.
Just learning a bit!
Sorry, this is out of original post!
I seeā¦ Thatās a very random and fairly useless thing to learn about, but okay. 
The ongoing issue I see repeated very often on the forum is that many people fail to understand the concept of a Rolling Release. There are no versions, it is as @Kresimir says. These names are not releases of a new version, they are just the latest iso image. If you keep your system updated then you already are at the latest āreleaseā. The only difference is that there may be an extra bit of software from the Endeavour devs that might be useful but you can find these things on the website. Basically the core system is Arch and you roll with it as Endeavour does. Update, backup and you are fine. 
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If you want extra software, thatās just one pacman -S command away.
And if you are not sure whether you need this extra software or not, you probably donāt.
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Yep K.I.S.S. until you learn a bit more. Then you can choose. Heck, 11 years now and Iām still learning! But for me that is part of the adventure. Iām still here so I guess Iām doing OK! 
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In reality, itās usually the opposite: the more you know, the more you want to K.I.S.S.
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Exactly!
P.S. I want to live in the woods latelyā¦
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Actually that is true! Hindsight is a great thing no?
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I hope youāre not a bear. There is a codeā¦ 
Naaahā¦iām just a clown!
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ClamAV still leading malware checker?