Syntax error How to get the System uptime with PowerShell?

How to get the System uptime with PowerShell?

To get the Windows System uptime with PowerShell, we can use the CIM Instance method with class name Win32_OperatingSystem. Once you use the mentioned class there is a property called LastBootupTime which shows the date when the computer is last rebooted.

Example

Get-CimInstance -ClassName Win32_OperatingSystem | Select LastBootUpTime

Output

LastBootUpTime
--------------
9/29/2020 8:12:08 AM

If we check the datatype of the above output, it should be DateTime because of the output format.

(Get-CimInstance -ClassName Win32_OperatingSystem).LastBootUpTime.Gettype()

Output

IsPublic IsSerial Name     BaseType
-------- -------- ----     --------
True     True     DateTime System.ValueType

We need now the uptime of the system in Days-Hours-Minutes format. So we will compare the difference between the current date/time with the Bootup date/time.

$bootuptime = (Get-CimInstance -ClassName Win32_OperatingSystem).LastBootUpTime
$CurrentDate = Get-Date
$uptime = $CurrentDate - $bootuptime
$uptime

Output

Days               : 6
Hours              : 0
Minutes            : 17
Seconds            : 38
Milliseconds       : 301
Ticks              : 5194583016830
TotalDays          : 6.01224886207176
TotalHours         : 144.293972689722
TotalMinutes       : 8657.63836138333
TotalSeconds       : 519458.301683
TotalMilliseconds  : 519458301.683

From the Output, we can say that the server is up from 6 Days and 17 minutes. We can also write the output as below.

Write-Output "Server Uptime --> Days: $($uptime.days), Hours: $($uptime.Hours), Minutes:$($uptime.Minutes)"

Output

Server Uptime --> Days: 6, Hours: 0, Minutes:17

To check the uptime on the remote computers, use -ComputerName parameter in the command. For example,

$servers = "Test1-Win2k12","Test1-Win2k16","ADDC"
$currentdate = Get-Date
foreach($server in $servers){
$Bootuptime = (Get-CimInstance -ClassName Win32_OperatingSystem -ComputerName $server).LastBootUpTime
   $uptime = $currentdate - $Bootuptime
   Write-Output "$server Uptime : $($uptime.Days) Days, $($uptime.Hours) Hours, $($uptime.Minutes) Minutes"
}

Output

Test1-Win2k12 Uptime : 5 Days, 22 Hours, 50 Minutes
Test1-Win2k16 Uptime : 5 Days, 23 Hours, 12 Minutes
ADDC Uptime : 6 Days, 2 Hours, 9 Minutes
Updated on: 2023-11-01T20:16:48+05:30

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