Powershell - Get system uptime

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$Computer = Read-Host   "Input Computer Name "
$LastBoot = (Get-WmiObject -Class Win32_OperatingSystem -ComputerName $Computer ).LastBootUpTime
$uptime = (Get-Date) - [System.Management.ManagementDateTimeconverter]::ToDateTime($LastBoot)
Write-Host  "$Computer uptime is:"     [$uptime]   [dd:hh:mm:ss.ms]

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