Here's how to check the installation dates On Mac computers:

Mac OS X 10.7

1. Click on the Macintosh hard drive on the desktop

2. Find the Application folder and open it

3. Scroll Down and open the Utilities folder

4. Click on the console window in the Utilities folder

5. Under Log Files, look in /var/log and click on install.log

6. Scroll to the very top of the list until you see the group of text “Install Mac OS X Lion”

7. The install date is next to the text

Mac OS X 10.6

1. Click on the Macintosh hard drive on the desktop

2. Find the Application folder and open it

3. Scroll Down and open the Utilities folder

4. Click on the console window in the Utilities folder

5. Under Log Files, look in /var/log and click on OSInstall.custom

Note: You can also type vi /var/log/OSInstall.custom in Terminal. Type :q to quit.

Update: this is for checking the installation date of your OS X in general. If you want to see the dates of installed updates to your OS X installation, check out the Apple discussion page on this topic.

That's how to check installation dates on Mac. This is incredibly useful to check when a Mac has been recently rebuilt. Do you have a rebuild policy and procedure at your place of work? If so, do you check the dates in the ways mentioned above?

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