Functions/Get-ComputerUptime.ps1
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function Get-ComputerUptime { <# .SYNOPSIS To mimic and extend the Get-ComputerUptime function found in PowerShell 6 or 7 .DESCRIPTION To mimic and extend the Get-ComputerUptime function found in PowerShell 6 or 7. Function aliased to 'Get-LastReboot' for backward compatibility .PARAMETER Since Switch to show last boot time, not the timespan since last boot .PARAMETER ComputerName String array of computers to check uptime against. If not given or is '.' it is replaced with $env:COMPUTERNAME. Aliased to 'CN', 'Server' .PARAMETER IncludeComputerName Switch on whether to include the computer name in the output .EXAMPLE Get-ComputerUptime Days : 0 Hours : 8 Minutes : 20 Seconds : 37 Milliseconds : 306 Ticks : 300373061593 TotalDays : 0.34765400647338 TotalHours : 8.34369615536111 TotalMinutes : 500.621769321667 TotalSeconds : 30037.3061593 TotalMilliseconds : 30037306.1593 .EXAMPLE Get-ComputerUptime -Since Sunday, February 28, 2021 12:47:04 PM .EXAMPLE Get-ComputerUptime -IncludeComputerName -Since ComputerName LastBoot ------------ -------- DemoLaptop 3/16/2021 12:59:24 PM .EXAMPLE Get-ComputerUptime -IncludeComputerName -Since -ComputerName server1, server2 ComputerName LastBoot ------------ -------- server1 3/18/2021 10:58:53 PM server2 3/17/2021 1:50:49 PM .NOTES To mimic and extend the functionality of the Get-Uptime function found in PowerShell 6 or 7 #> #region Parameter [CmdletBinding(ConfirmImpact = 'Low')] [OutputType('psobject')] Param( [switch] $Since, [Alias('CN', 'Server')] [string[]] $ComputerName, [switch] $IncludeComputerName ) #endregion Parameter begin { Write-Verbose -Message "Starting [$($MyInvocation.Mycommand)]" if ($ComputerName -eq '.' -or $ComputerName -eq '' -or $null -eq $ComputerName) { $ComputerName = $env:COMPUTERNAME } } process { foreach ($curComputerName in $ComputerName) { try { $LastBootUpTime = (Get-CimInstance -ClassName Win32_OperatingSystem -ComputerName $curComputerName -ErrorAction Stop).LastBootUpTime if ($Since) { if ($IncludeComputerName) { New-Object -TypeName psobject -Property ([ordered] @{ ComputerName = $curComputerName LastBoot = $LastBootUpTime }) } else { Write-Output $LastBootUpTime } } else { $TimeSpan = ((Get-Date) - $LastBootUpTime) if ($IncludeComputerName) { $TimeSpan | Add-Member -MemberType NoteProperty -Name ComputerName -Value $curComputerName } Write-Output ($TimeSpan | Select-Object -Property *) } } catch { Write-Error -Message "Either computer [$curComputerName] is not up, or you don't have permission to read from WMI objects." } } } end { Write-Verbose -Message "Ending [$($MyInvocation.Mycommand)]" } } Set-Alias -Name 'Get-LastReboot' -Value 'Get-ComputerUptime' -Description 'Alias for Get-ComputerUptime' |