Get-SystemUptime

Windows: Calculates the system uptime and last boot time

Script

#Requires -Version 5.1

[CmdletBinding()]
Param
(
    [string]$ComputerName = $env:COMPUTERNAME,

    [pscredential]$Credential
)

Process
{
    try
    {
        $session = $null
        $cimParams = @{
            'ClassName'   = 'Win32_OperatingSystem'
            'ErrorAction' = 'Stop'
        }

        if ($ComputerName -ne $env:COMPUTERNAME)
        {
            $sessionParams = @{
                'ComputerName' = $ComputerName
            }
            if ($null -ne $Credential)
            {
                $sessionParams.Add('Credential', $Credential)
            }
            $session = New-CimSession @sessionParams
            $cimParams.Add('CimSession', $session)
        }

        $os = Get-CimInstance @cimParams | Select-Object -First 1
        
        $bootTime = $os.LastBootUpTime
        $uptime = New-TimeSpan -Start $bootTime -End (Get-Date)

        $result = [PSCustomObject]@{
            LastBootTime = $bootTime
            UptimeDays   = $uptime.Days
            UptimeHours  = $uptime.Hours
            UptimeMinutes = $uptime.Minutes
            UptimeString = "$($uptime.Days) Days, $($uptime.Hours) Hours, $($uptime.Minutes) Minutes"
            ComputerName = $ComputerName
        }

        Write-Output $result
    }
    catch
    {
        throw
    }
    finally
    {
        if ($null -ne $session)
        {
            Remove-CimSession $session
        }
    }
}

Customize

ComputerName string

Specifies the name of the computer to query. Defaults to the local computer.

env string

Credential pscredential

Specifies a PSCredential object for remote connection.