Find out Windows Installation Date using various methods

There may be a time, when you may want to or need to know your Windows installation date or the date and time when your Windows OS was installed on your computer. There are several ways to find this out, which we will discuss in this post.

Windows Installation Date

To find the installation date of your Windows 10 OS:

  1. You may see the Windows folder Properties
  2. Check the Windows Registry
  3. Use the systeminfo command line tool
  4. Use a PowerShell command.

1] The easiest way to find out when your Windows OS was installed, would be to right-click the Windows folder, select Properties and see the entry in front of Created under the General tab. Here you will see the time and date.

Windows Installation Date

But if you have  upgraded your Windows version to a higher version, you will see the date when the earlier version was installed and not when the latest version was installed or upgraded. In my case it shows the day I first installed Windows 8 – and not the Windows 8.1 date.

2] The Windows Installation Date is also stored in the Windows Registry in the following key, as UNIX time, ie as a 32-bit value displaying the time in number of seconds since 1st Jan 1970.

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


My Windows was installed 1382359164 seconds since 1st Jan 1970, so you need to do some calculations to arrive at the figure.

3] The easiest and the most convenient way of finding the Windows Installation Date would be to use the systeminfo tool, which we have already talked about. To use this built-in tool, open a command prompt window, type the following and hit Enter:

systeminfo | find /i "Install Date"

Windows Installation date

You will be able to see the Original Install Date.

4] The Windows install date is also stored in the property InstallDate of the WMI class Win32_OperatingSystem. You can use PowerShell to get the date and time of installation. To find out the date, open Windows PowerShell as Administrator, change path to C drive, type the following and hit Enter:

([WMI]'').ConvertToDateTime((Get-WmiObject Win32_OperatingSystem).InstallDate)


The date and time your Windows was installed will be displayed!

Now read: How to find out System Uptime.

Enjoy the rest of the day! 🙂

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Anand Khanse is the Admin of, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.

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