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 OS X just fine. You can then check if it was set correctly by running the first command again. Which means, you can just enter it exactly like this: date -uĮnter the command and hit return. To avoid trouble with timezones, we will use UTC time instead (). Below you see what the command should be for your current time and date –. This command will be entered as follows: date -u Įvery bracket should be replaced with a two-digit number based on UTC time. If you don’t want to erase your Mac, go ahead and click the Reinstall macOS option, then follow the onscreen prompts to download and reinstall the operating system.

For some reason, it might have been reset to 2001, in which case we need to set it to the right date. But first, if you need to erase your Mac, now is the time to do so: click Disk Utility and erase the Macintosh HD Data partition of your startup drive. The result of this command will be the date that the system currently has been set to. Once in the terminal enter the following command and hit return/enter: date You can check this by going to utilities and opening the terminal. Now, if you haven’t used your Mac for a while, the error might be caused by an incorrect system date setting. When you’re booting your Mac from the recovery partition and are planning to reinstall OS X, you might be met by the following message:Īn error occurred while preparing the installation. March 2013 Changing system date from Terminal – OS X recovery We walk you through the actual installation recommend some post-install tasks discuss some upgrade challenges and help you decide if a “clean install”-erasing your drive and starting from scratch-is for you.18. In the articles below, we cover the requirements for running Mavericks the things you should do to get your Mac ready and the download process.

But that doesn’t mean you should make the jump with no preparation, or that there are no important decisions to make along the way.Īs we do with every new version of OS X, we’ve installed Mavericks more times than we can count in order to put together a comprehensive guide to installing the latest Mac OS. A few clicks (and some patience) is all it takes to install OS X 10.9 over your existing copy of Mountain Lion, Lion, or Snow Leopard (or, if you’re brave, even Leopard). Mavericks (OS X 10.9) is here! And just as with Lion (OS X 10.7) and Mountain Lion (OS X 10.8) before it, getting Mavericks is as easy as downloading an installer from the Mac App Store. 9 on any of the newer (OSX based) macs I was thinking about setting up a small partition with OS9 just for the fun of playing around with it and using some of my old games I just found lying around.

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