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:
An error occurred while preparing the installation. Try running again
Optional: Replacing the Clock With Itsycal. Itsycal is great, but it doesn’t quite give you want Windows offers—that is, you can’t click the current time to see a calendar. If you want to replace your clock entirely with Itsycal, you can do that. First, let’s remove the default Mac clock. Click it, then click “Open Time & Date. I have a MacBook Pro 15' from 2015. A few days ago when booted the clock was reset to 1.1.2038 00:00. I had to de- and reactivate the auto-set function in the setting multiple times before it worked again. Since then at every restart it goes back to that time (not 00:00, but as if the clock had been running since then).
Now, if you haven’t used your Mac for a while, the error might be caused by an incorrect system date setting. You can check this by going to utilities and opening the terminal. Once in the terminal enter the following command and hit return/enter:
If you upgrade to the Pro version, you’ll get access to some additional features, like disabling Turbo Boost automatically depending on fan speed, remaining battery time, and whether your Mac is connected to a power source. As you can see, it is easy to manually enable or disable the Turbo boost feature in Mac. Choose Apple menu System Preferences, then click Date & Time. Click the lock in the corner of the window, then enter your administrator password to unlock the settings. (The settings are dimmed when locked.) In the Date & Time pane, make sure that ”Set date and time automatically” is selected and your Mac is connected to the internet.
The result of this command will be the date that the system currently has been set to. For some reason, it might have been reset to 2001, in which case we need to set it to the right date. To do this, we enter a new command. This command will be entered as follows:
Every bracket should be replaced with a two-digit number based on UTC time. Below you see what the command should be for your current time and date – . To avoid trouble with timezones, we will use UTC time instead (). Which means, you can just enter it exactly like this:
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 OS X just fine.
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