Windows 7 saves its installation date. It can be viewed with

cmd /k systeminfo | find "Original Install Date"

in the command prompt. How can I change the saved value to a different day?

  • 2
    Do you intend to rotate(extend) your Trial version for some more time? – uDaY Apr 4 '12 at 17:01
  • No I don't. I just wanna change the install date =). – Gaspa79 Apr 4 '12 at 18:04
  • Of course I have. My window's legit if that's why you're asking. – Gaspa79 Dec 11 '13 at 19:51

The install date is stored in the registry value as UNIX time (32-bit value containing the number of seconds since 1/1/1970)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\InstallDate


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