Find the original installation time for Windows 10

Find the original installation time for Windows 10

Q. How can I find the installation time of my Windows 10 system?

A. Each time you deploy a new branch it updates the installation time you would normally find via InstallDate. To find the original installation date of the OS you can instead look at HKEY_LOCAL_MACHINE\SYSTEM\Setup. There will be keys for each installation named Source OS (Updated on <date>). If you go inside the key there is a value InstallDate. This is the UNIX time (number of seconds since 1/1/1970). To convert take the decimal value and use in a UNIX time conversion tool, such as This will show the installation time of the OS. Therefore find the oldest value which is the original installation time of the OS before any later branch deployments.

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