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How to get uptime in Windows using PowerShell

If you need to monitor how long the machine has been up, or whether the machine rebooted by itself or someone has just rebooted the server for without any reason. Then getting the uptime of the machine or server is important.

PowerShell code below gets the uptime by using a command line and processing its output.

#==========================
#get the uptime and save to text file
Invoke-command -ScriptBlock { net statistics server >c:\online.txt }
 $xcmd = select-string -path "c:\online.txt" -Pattern "since" | select line |ft -hidetableheaders
 write-output $xcmd | out-file c:\online1.txt
 $stry = get-content c:\online1.txt | out-string
 $concatString = $stry.Substring(18,15)
Write-host  $concatString

#Get the date
$StartDate= [datetime] $concatString
$EndDate= (GET-DATE)
$xdate = NEW-TIMESPAN –Start $StartDate –End $EndDate
write-output $xdate
#==========================

Sample output:

Days              : 3
Hours             : 12
Minutes           : 12
Seconds           : 17
Milliseconds      : 271
Ticks             : 439372713503
TotalDays         : 0.508533233221065
TotalHours        : 12.2047975973056
TotalMinutes      : 732.287855838333
TotalSeconds      : 43937.2713503
TotalMilliseconds : 43937271.3503

Basically, it shows that the machine has been online for around 3 days and 12 hours.

Code in getting the date and time difference is taken from this link below:
https://blogs.technet.microsoft.com/heyscriptingguy/2013/12/28/powertip-get-time-difference-between-dates-with-powershell/

Code explanation:

Code below will execute the command line net statatisics server and save the output to c:\online.txt
Change “c:\online.txt” to the desired path or location

Invoke-command -ScriptBlock { net statistics server > c:\online.txt }


Code below will find the  pattern or the string “since” on online.txt file, once the pattern matches the whole line is selected and ft -hidetableheaders will  format the table and hide the headers of the output.

 $xcmd = select-string -path "c:\online.txt" -Pattern "since" | select line |ft -hidetableheaders


Code below will write the output of the variable $xcmd to a new file online1.txt

 write-output $xcmd | out-file c:\online1.txt


Code below will get the content of online1.txt and convert the output as string and save it to $stry variable.

 $stry = get-content c:\online1.txt | out-string


Code below is just a concatenation of the string, basically stripping the characters or data that is not needed. Concatenation will start at column 18 up to 15 characters.

 $concatString = $stry.Substring(18,15)


Code below is just to display the concatenated string to make sure that the concatenated string is the string needed.

Write-host  $concatString


Chunks of code below is taken from Technet the algorithm behind it is unknown, anyway it does the job and it works very well then just use it.

$StartDate= [datetime] $concatString
$EndDate= (GET-DATE)
$xdate = NEW-TIMESPAN –Start $StartDate –End $EndDate
write-output $xdate
================================
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