There are a few ways you can find this information. one way is through the standard commmand prompt and the other is through powershell! Here are the syntaxes..
 
CMD –
 
systeminfo | find /i "install date"
 
PowerShell –
 
([WMI]”).ConvertToDateTime((Get-WmiObject Win32_OperatingSystem).InstallDate)
 
 
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