Windows

Windows Vista

Start > run > cmd > systeminfo

WinXP Pro and higher

Start > run > cmd > systeminfo

Note: systeminfo.exe is only available on WinXP Pro and higher.

WinXP Home Edition

Start > run > hcp://system/sysinfo/sysinfomain.htm -> View the status of my system hardware and software

Under "System Software" the operating system should be listed with the install date under "Date Created"

Mac OS X

Step 1:

Open Macintosh hard drive on desktop, find Application folder and open it.

Step 2:
Scroll Down and open Utilities folder.

Step 3:
Open the console window in the Utilities folder.

Step 4: In the console, expand the directories as shown below, find and click on OSInstall.custom, you will find the OS install date as shown below.

or you can type vi /var/log/OSInstall.custom on the Terminal window.

(:q to quit vi)

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