Section 7.13. Returning System Uptime

7.13. Returning System Uptime

First, start with a function for converting WMI date formats into DateTime objects:

     function parsewmidate {         param($wmidate)         $year = [int]$wmidate.substring(0, 4)         $month = [int]$wmidate.substring(4,2)         $day = [int]$wmidate.substring(6,2)         $hour = [int]$wmidate.substring(8,2)         $min = [int]$wmidate.substring(10,2)         $sec = [int]$wmidate.substring(12,2)         new-object DateTime $year,$month,$day,$hour,$min,$sec     }

Use the Win32_OperatingSystem WMI class to calculate uptime and time since last rebuild:

     function uptime {         $reboot = parsewmidate $(get-wmiobject Win32_OperatingSystem).LastBootupTime         new-timespan $reboot $(get-date)     }     function sinceRebuild {     {         $rebuild = parsewmidate $(get-wmiobject Win32_OperatingSystem).InstallDate         new-timespan $rebuild $(get-date)     }