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Installing OS X: What to do when ‘this copy of the install OS X application cannot be verified’

Roman Loyola | July 26, 2016
If you encounter an error when trying to install a fresh operating system, it could be a problem with the date and time.

osx boot install error terminal old date

  1. If your Mac is connected to the internet, you can tell your Mac to check online for the current date and time. You can do this by typing at the prompt ntpdate -u time.apple.com and then pressing Return.

osx boot install error terminal set date auto

Your Mac should now have the current date and time. If you enter date again (as I did in the screenshot above) the information that appears will be current. You can now run the OS installer.

If you don’t have an internet connection

You can still use Terminal to set the date. Go into the Terminal as described above, then follow these steps.

  1.  
    1. At the prompt, type date to see the date that’s on the Mac.

    2. Figure out the numerical representation of the date and time. The pattern you need to follow:

      • Month: in two-digit format. For example, July is 07.
      • Day: in two-digit format. For example, the 7th is 07.
      • Time: in military format of hours and minutes. For example, 2:00 p.m. is 1400.
      • Year: Last two digits.

In my example, the numerical representation is 0719140016. This stands for July (07) 19, (19), 2 p.m. (1400), 2016 (16).

  1. At the prompt, type date [numerical], with [numerical] being the representation you figured out. In my example, I typed date 0719140016. Then press Return.

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The date should be set. You can check the date again by typing date at the prompt. You can now run the installer.

 

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