[Bug]: DateTime parsing fails on non-US locale runners in WorkflowPostProcess.ps1

[BW-PA]

AL-Go version

8.0

Describe the issue

The WorkflowPostProcess.ps1 script reports an error when running on self-hosted GitHub runners with non-US locale settings (e.g., Australian locale).

Error:

Exception calling "Parse" with "1" argument(s): "String '11/27/2025 05:17:03' was not recognized as a valid DateTime."

Location:
WorkflowPostProcess.ps1 line 71:

powershell$workflowTiming = [DateTime]::UtcNow.Subtract([DateTime]::Parse($telemetryScope.workflowStartTime)).TotalSeconds

Root Cause:
[DateTime]::Parse() uses the current culture settings. On Australian locale runners (dd/MM/yyyy format), it fails to parse US-format dates (MM/dd/yyyy) like 11/27/2025.

If timestamps are always in US format: Could consider using culture-invariant parsing, for example the below runs correctly when given a US date format on an australian locale machine

$workflowTiming = [DateTime]::Parse($telemetryScope.workflowStartTime, [System.Globalization.CultureInfo]::InvariantCulture)

Expected behavior

US date formats to work correctly when using non-US locale self hosted runners

Steps to reproduce

This Line from WorkflowPostProcess.ps1 line 71: but modified to run in powershell directly for testing.

PS C:\Windows\system32> $workflowTiming = [DateTime]::UtcNow.Subtract([DateTime]::Parse('11/27/2025 05:17:03')).TotalSeconds
Exception calling "Parse" with "1" argument(s): "String was not recognized as a valid DateTime."
At line:1 char:1
+ $workflowTiming = [DateTime]::UtcNow.Subtract([DateTime]::Parse('11/2 ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : FormatException

If I change to use InvariantCulture

PS C:\Windows\system32> $workflowTiming = [DateTime]::UtcNow.Subtract([DateTime]::Parse('11/27/2025 05:17:03', [System.Globalization.CultureInfo]::InvariantCulture)).TotalSeconds
$workflowTiming 
81019.7661082

Additional context (logs, screenshots, etc.)

I believe the source of the issue is Line 71 of this file https://github.com/microsoft/AL-Go/blob/main/Actions/WorkflowPostProcess/WorkflowPostProcess.ps1

when $telemetryScope.workflowStartTime contains a US date format and the script is running on an Australian Locale self hosted runner it errors.

Internal work item: AB#614767