Occasionally for some reason, you may need to know when exactly Windows 10 was installed on your computer. Now, you can read this post to get three ways of how to check Windows 10 installation date.
Way 1: Check Windows 10 installation date by Command Prompt
Step 1: Open Command Prompt as administrator.
Step 2: Type systeminfo | find /I “Install Date” and press Enter key. Then on the screen, it will display your Windows 10 original install date.
Alternative: Or you can type WMIC OS GET installdate and press Enter key to get the installation date.
Way 2: Check Windows 10 installation date by Windows PowerShell
Step 2: Type CD C:\ and press Enter key to change the path to C drive where Windows 10 is installed. Then type ([WMI]”).(ConvertToDateTime(Get-WmiObject Win32_OperatingSystem).InstallDate) and press Enter key. Then it will display your Windows 10 installation date.
Way 3: Check Windows 10 installation date by Registry Editor
Step 1: Access Windows 10 Registry Editor.
Step 2: Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion. Then on the right-side pane locate the InstallDate key and its value. There in the brackets, it displays a number in seconds. You can convert it into the date, which is just your Windows 10 installation date.
But then again, it seems troublesome to perform such a math calculation. Anyhow it is one way for references only.