How to detect the El Cap installation Date

So El Cap is a bust for me (many questions NAS), I need to go back to Yosemite.  Someone at - it a good way to detect what day I did the install on?  Can I restore to the last TM before that?

Thank you.

Open the App Store, then click on purchases.  You should see a list of all applications that you downloaded and the date that you installed them.

Tags: Mac OS & System Software

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