I have a MacBook pro and I'm trying to instal OS X El Capitan on a clean formatted SSD hard drive. While installing I encounter an error saying "this copy of the instal os x el capitan application can't be verified...". After some search in the internet I realized the problem is due to date and time being not correct. I corrected the time but I couldn't find a way to change the time zone because whenever I type "systemsetup" command I receive the "command not found" error. I will be more than happy if anyone can help me with this problem. Thanks

  • If the linked Q&A doesn't answer your question, please edit it to indicate in more detail what you have tried and where it fails.
    – nohillside
    Commented May 3, 2016 at 5:51

1 Answer 1


As suggested by this answer, try setting the date to one earlier than the current date. The timezone should not matter at the time of installation.

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