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Table of Contents
2. Use PowerShell (Alternative Method)
3. Check via Registry Editor (Manual Inspection)
Important Notes:
Home System Tutorial Windows Series How to find the original install date of your Windows OS

How to find the original install date of your Windows OS

Jul 31, 2025 am 08:20 AM

Use Command Prompt by typing systeminfo | find "Original Install Date" to quickly display the Windows original install date. 2. Alternatively, in PowerShell, run (Get-CimInstance -ClassName Win32_OperatingSystem).InstallDate and convert it using .ConvertToDateTime() for a readable format. 3. Or check the registry at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion for the InstallDate Unix timestamp and convert it to a human-readable date. The date reflects the first installation or clean install, not upgrades or feature updates, and remains unchanged after system repairs or version upgrades, providing an accurate record of the initial setup.

How to find the original install date of your Windows OS

Finding the original install date of your Windows operating system can be helpful for troubleshooting, tracking system age, or knowing when you last wiped your drive. Windows doesn’t display this date prominently, but it’s stored in the system and can be retrieved easily. Here’s how:

How to find the original install date of your Windows OS

1. Check Using Command Prompt (Fastest Method)

The quickest way to find the original installation date is through the Command Prompt using the systeminfo command.

Steps:

How to find the original install date of your Windows OS
  • Press Win R, type cmd, and press Enter.
  • In the Command Prompt window, type:
    systeminfo | find "Original Install Date"
  • Press Enter.

You’ll see output like:

Original Install Date:         3/15/2022, 1:45:22 PM

? Note: The date shown is when Windows was first installed or activated — not when you upgraded from a previous version (e.g., upgrading from Windows 10 to 11 won’t reset this date).

How to find the original install date of your Windows OS

2. Use PowerShell (Alternative Method)

PowerShell offers a cleaner and faster way, especially if you want just the date without extra text.

Steps:

  • Press Win X and select Windows Terminal (Admin) or PowerShell.
  • Run this command:
    (Get-CimInstance -ClassName Win32_OperatingSystem).InstallDate

This returns a timestamp in UTC format like:

20220315184522.000000 000

To convert it to a readable date:

(Get-CimInstance -ClassName Win32_OperatingSystem).ConvertToDateTime((Get-CimInstance -ClassName Win32_OperatingSystem).InstallDate)

Now you’ll see a clean date and time:

March 15, 2022 1:45:22 PM

3. Check via Registry Editor (Manual Inspection)

The install date is also stored in the Windows Registry. This method is useful if you prefer browsing system settings.

Steps:

  • Press Win R, type regedit, and press Enter.
  • Navigate to:
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
  • Look for the value named InstallDate on the right panel.
  • It will show a number — this is a Unix timestamp (seconds since January 1, 1970).

To convert it:

  • Use an online Unix timestamp converter.
  • Or, in PowerShell, run:
    $timestamp = (Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion").InstallDate
    (Get-Date -Date "1/1/1970").AddSeconds($timestamp).ToLocalTime()

Important Notes:

  • The install date does not change after feature updates or most system repairs.
  • A clean install of Windows resets this date; upgrades do not.
  • If you reinstalled Windows and restored from a backup, the date may reflect the original install, not the reinstallation.

Basically, the Command Prompt method is the fastest for most users. If you're comfortable with PowerShell, it gives more flexibility. The registry method is good for deeper inspection but requires extra steps to interpret the date.

Not complicated — just hidden in plain sight.

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