How to Check When Windows Was Installed on Your PC
The original date and time Windows was installed on your PC appears in the Command Prompt using a built-in tool called systeminfo. Finding this install date lets you check how long your current setup runs without a wipe, spot an aging system, or see if a repair shop put a fresh copy of Windows on your hard drive.
Windows tracks this exact setup moment the very first time the operating system boots up on your computer. You can also check your system uptime in the Task Manager , but that only shows how many days have passed since your last restart rather than the actual installation day.
Open Command Prompt or PowerShell and type `wmic os get installdate` or `([WMI]”).ConvertToDateTime((Get-WmiObject Win32_OperatingSystem).InstallDate`) respectively. This will display the original installation date of your Windows operating system.
What happens when you are done?
This confirmation provides a clear baseline for your system's maintenance history, helping you decide if a clean install is needed.
Method 1Using Command Prompt
Checking your Windows installation date using Command Prompt takes just a few seconds. You only need to open the Command Prompt tool from the Start menu , type a short command, and press Enter to view the exact date and time your operating system was installed.
- Click the Start menu.
- Type Command Prompt in the search bar.
- Select the app from the list.
When the black window opens, type this command and press Enter:
wmic os get installdate
You will see a line that looks like this:
Original Install Date: 20210629200901.000000+000
If you want to see more details, simply type the following and press Enter:
systeminfo
For more details, visit the official Microsoft documentation on systeminfo.
Method 2Using PowerShell
Finding your Windows installation date using PowerShell requires running a simple command in the terminal. You can right-click the Start button, open PowerShell or Terminal, and enter a quick command to instantly reveal the exact date your PC got its current operating system.
- Right-click the Start button and select Terminal or PowerShell.
- Type the following command and press Enter:
([WMI]'').ConvertToDateTime((Get-WmiObject Win32_OperatingSystem).InstallDate)
This command translates the raw system data into a human-readable format immediately.
Method 3Using the Registry Editor
Viewing your Windows installation date through the Registry Editor involves opening the system registry and locating a specific setup value. You can find the exact date Windows was installed by browsing to the correct folder path inside the registry and reading the stored data.
First, open Registry Editor by typing regedit in the Start menu search.
Navigate to this path:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
Find the file named InstallDate. The value you see is in "epoch time." To make sense of it, copy that number and use an epoch converter website to turn it into a normal date.
Summary
Finding your Windows installation date is simple. You can use the Command Prompt, PowerShell, or the Registry Editor. Remember that if you upgraded your OS, the date reflects that upgrade. Always check your OS build version to ensure your system is fully up to date.
Does a Windows update change the original installation date?
Generally, no. Standard Windows updates do not change the original installation date. However, performing a major "feature update" or a "repair install" of the operating system can sometimes reset this timestamp to the date the new files were deployed to your hard drive.
Why does the Registry show a different date than the Windows folder?
The Windows folder creation date reflects when the directory was first placed on the drive. The Registry InstallDate reflects when the OS configuration was finalized. If you moved your drive or performed a major upgrade, these dates may differ due to how Windows tracks system deployment.
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About the Author
Richard
Tech Writer, IT Professional
Richard, a writer for Geek Rewind, is a tech enthusiast who loves breaking down complex IT topics into simple, easy-to-understand ideas. With years of hands-on experience in system administration and enterprise IT operations, he’s developed a knack for offering practical tips and solutions. Richard aims to make technology more accessible and actionable. He's deeply committed to the Geek Rewind community, always ready to answer questions and engage in discussions.
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