How to find the installation date of Windows
Jul 30, 2025 am 04:57 AMUse Command Prompt by typing systeminfo | find "Original Install Date" to instantly see the original Windows installation date. 2. Alternatively, use PowerShell with (Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion").InstallDate and convert the Unix timestamp to a readable date using [timezone]::CurrentTimeZone.ToLocalTime(([datetime]'1/1/1970').AddSeconds($timestamp)). 3. Or check the registry at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion for the InstallDate value and convert the timestamp accordingly. The displayed date reflects the initial installation of the current Windows instance, not updates or in-place upgrades, and remains unchanged unless a clean install was performed.
Finding the installation date of Windows can help you determine how long you've been using your current system, especially useful for troubleshooting, upgrades, or tracking system performance over time. Here’s how to check it accurately on most Windows versions (Windows 10 and 11):

1. Using Command Prompt (Fastest Method)
The systeminfo
command displays the original installation date of Windows.
Steps:

- Press
Win R
, typecmd
, and press Enter. - In the Command Prompt, type:
systeminfo | find "Original Install Date"
- Press Enter.
You’ll see output like:
Original Install Date: 5/12/2023, 3:15:22 PM
? This shows the actual date Windows was first installed — even if you’ve upgraded versions since.
2. Using PowerShell (Alternative)
PowerShell gives you more control and is just as quick.
Steps:
- Press
Win X
and select Windows Terminal (Admin) or PowerShell. - Run this command:
(Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion").InstallDate
This returns a Unix timestamp (like 1683878400
). To convert it to a readable date:
$timestamp = (Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion").InstallDate [timezone]::CurrentTimeZone.ToLocalTime(([datetime]'1/1/1970').AddSeconds($timestamp))
This will display the correct local date and time of installation.
? Why a timestamp? Windows stores the install date in Unix time (seconds since Jan 1, 1970) in the registry.
3. Check via Registry Editor
The installation date is stored in the Windows Registry.
Path:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
Steps:
- Press
Win R
, typeregedit
, press Enter. - Navigate to the above path.
- Look for the InstallDate value (a large number).
- Use an online Unix timestamp converter or the PowerShell method above to translate it.
Important Notes:
- The date shown is not the current OS build or update date — it’s the original install date of the Windows instance.
- If you did a clean install, this date resets.
- Upgrading from Windows 10 to 11 usually preserves the original install date unless it was a fresh install.
- Some third-party tools (like Belarc Advisor or WinDirStat) also display this info, but built-in methods are safer and more reliable.
Basically, the Command Prompt method is the quickest and most straightforward. If you want more precision or automation, go with PowerShell. Just remember: the date reflects the first time that copy of Windows was set up on the machine.
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