I just wonder if there are any ways to check the date and time when the Mac OS X was installed.

I guess the system must store the information of this type somewhere, but I don't know how to mine it.

In my case, my MacBook Pro was stolen. When I found it 10 days later, the hard disk had been repartitioned and it had been installed with a fresh Yosemite version.

Now that it turns out that if I know the time/date the Yosemite was installed, I may be able to identify who is the thief.


  • Are you more worried about prosecuting the thief, or security as to what they installed?
    – Daniel
    Oct 16, 2015 at 21:11
  • Well, to avoid future incidents as such not only for me but my friends as well. Also, it's much better to know which sheep is black. Oct 17, 2015 at 14:53
  • Yeah, true. Good answer though.
    – Daniel
    Oct 17, 2015 at 16:15

1 Answer 1


I have found the answer to my question in this post at the macrumors.com forum.

In the System Information application (Apple menu, hold option key, and the first item changes from "About this Mac" to "System Information"), look under the Installations tab. The exact time and date of the OS X install will be listed there.

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