Install macOS Mojave Popup

Change Date in macOS Mojave via Terminal 2018

Rafal Kukla macOS, Support Leave a Comment

If you have following error message during macOS Install / Upgrade to macOS High Sierra, Mojave or technically any other macOS Software.

Installation Failed
An error occurred while preparing the installation. Try running again.
It is most likely because your Mac System Date is incorrect.

Boot into macOS Recovery again by restarting your Mac and holding CMD + R keys together.

While in the Recovery mode, cancel the installation Process, and navigate to Utilities and open the Terminal app. Once in the Terminal, enter the following command and hit return / enter:

You should see something like this:

Example of Terminal command date

If your time and date is incorrect, use the following command to setup correct date to continue with the installation or upgrade.

example: date {month}{day}{hour}{minute}{year}
Every bracket should be replaced with a two-digit number. For example, November 16th 2018 21:16 would become the following command:

date 1116211618
Example of Terminal output Fri 16 Nov 2018 20:37:03 GMT

Enter the command and hit return. You can then check if it was set correctly by running the first command again.

If the date was wrong, it was likely that which caused the error, and after you quit the terminal it should be able to install your macOS.

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