Powershell null values

[pccarrick]

Hi I wonder if anyone can help with a very strange problem I am having with a task sequence running on SCCM 2012 R2 SP1.

 

I have a powershell script which runs in a task sequence and gives the user an option to select a time to delay running of the task.

 

The problem I have is that the below section of commands is returning a value of null on some machines in one of our office's. However it is running fine in other offices, if I run the script local on the machine it works fine which is really confusing.

 

 

$datetime = get-date

$current_time = $datetime.ToShortTimeString()

 

$global:AlarmTime = $global:Time.Value

$global:start_time = $global:AlarmTime.ToShortTimeString()

$global:endtime = (new-timespan -Start ($current_time) -end ($global:start_time)).Totalminutes

the problem is with the $global:endtime all other values are returning correct.

 

 

I am running this in the task sequence as a run command line with the following syntax.

 

ServiceUI.exe -process:TSProgressUI.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -WindowStyle Hidden -ExecutionPolicy Bypass -WindowStyle Hidden -ExecutionPolicy Bypass -noprofile ".\Updates.ps1"

 

If I run it as a powershell script rather than a command line it won't run at all.

 

 

any help or advise on this would be really appreciated.