The WMI class Win32_OperatingSystem provides rich information about a number of datetime information, including the date of last boot-up and the installation time:
$dateTimeProps = 'InstallDate', 'LastBootupTime', 'LocalDateTime', 'CurrentTimeZone', 'CountryCode' Get-CimInstance -ClassName Win32_OperatingSystem | Select-Object -Property $dateTimeProps
The result looks similar to this:
InstallDate : 03.09.2019 12:42:41 LastBootupTime : 03.05.2020 12:15:45 LocalDateTime : 04.05.2020 10:43:55 CurrentTimeZone : 120 CountryCode : 49
If you’d like to know how many minutes your system is running, or how many days have been passed since it was installed, use New-TimeSpan:
$os = Get-CimInstance -ClassName Win32_OperatingSystem $installedDays = (New-TimeSpan -Start $os.InstallDate).Days $runningMinutes = [int](New-TimeSpan -Start $os.LastBootupTime).TotalMinutes "Your copy of Windows was installed $installedDays days ago." "Your system is up for {0:n0} minutes." -f $runningMinutes
The result looks like this:
Your copy of Windows was installed 243 days ago. Your system is up for 1.353 minutes.
The Get-CimInstance cmdlet can be used to query the information locally and for remote machines (provided you have proper permissions). For more information on how to use Get-CimInstance remotely, visit https://powershell.one/wmi/remote-access.
