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How To Check When Your Windows 7 Was Installed?

Ever wonder when Windows 7 was installed on the laptop that you have just received from dealer? Here you go, if you curious but wonder how to check date and time the Windows 7 was installed.

Why bother to check it out? Well, that could be one of the measurements used to study Windows 7 performance over the time – if you believe too that a new installed Windows system always performs better than ever :-)

Uses native command line utilities to check Windows 7 install date

Open Command Prompt window, with or without real administrator privilege, and run either one of these commands to check your Windows 7 original installation date:
wmic os get installdate
systeminfo | find "Install Date"

Uses native commands to check Windows 7 install date.

The Windows 7 install date can also be found on this registry key, which is stored in Unix epoch time format (i.e. number of seconds since 1970-01-01 00:00:00 UTC):
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\InstallDate

You may use GNU date (available on most Linux distributions) to convert the said epoch time to human-readable format, e.g. to convert 1234567890:
date -u -d "1970-01-01 1234567890 secs"

Bear in mind that the date returned by that GNU date command syntax is in UTC format and thus one needs to further convert the UTC to local time format.

Apparently, using wmic or systeminfo is much easier than Registry :-)

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