Convert Reg_Binary Data to Date using Powershell

Posted on 2013-01-15
Last Modified: 2013-01-16
I need some help converting data out of the registry and figuring out what the last shutdown time of the workstation is/was.

I am using the PSRemoteRegistry module to get the value from the remote machine and need to convert it to a readable date.

Please see code below:

Import-Module PSRemoteRegistry

$key = "SYSTEM\CurrentControlSet\Control\Windows"

$data = (get-regbinary -computerName "xxx" -key $key -Value "ShutdownTime").data

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The output of this gives me:

Question by:dhalliday
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Expert Comment

by:John Jennings
ID: 38780567
Use this powershell command instead of the script you've written. It's only one line, and will automatically show you the last registered shutdown event in the System event log.

Get-WinEvent -FilterHashtable @{logname='system';id=6006} -MaxEvents 1

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PS - You can add "-ComputerName {nameofremotemachine}" (without quotes) to the snippet above to run it on a remote machine.
LVL 70

Accepted Solution

Qlemo earned 500 total points
ID: 38780601
It's a FileTime structure, constructing a 64 bit integer.
$key = "SYSTEM\CurrentControlSet\Control\Windows"
$data = (get-regbinary -computerName "xxx" -key $key -Value "ShutdownTime").data
$time = [DateTime]::FromFileTime( (((((($data[7]*256 + $data[6])*256 + $data[5])*256 + $data[4])*256 + $data[3])*256 + $data[2])*256 + $data[1])*256 + $data[0])

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$key = "SYSTEM\CurrentControlSet\Control\Windows"
(get-regbinary -computerName "xxx" -key $key -Value "ShutdownTime").data | foreach-object `
-Begin { $time = 0; $i = 0 } `
-Process { $time += $_ * [math]::Pow(256,$i++) } `
-End { $time = [DateTime]::FromFileTime($time) }

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Note that the Registry shutdown time is a few seconds behind the eventlog entry.

Author Closing Comment

ID: 38782818
Thanks for the quick turn around on the solution.  It worked perfectly.

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