Summary: Use a cmdlet from the PSCX module to get your system uptime.
How can I easily find my system uptime if I have the Windows PowerShell community extensions (PSCX) installed?
Use the Get-Uptime cmdlet from the PSCX module:
Note For more information about the Windows PowerShell Community Extension project, see my post,
Install the PSCX and 80 New Cmdlets to Ease PowerShell Use.