What is the easiest PowerShell script to check the creation date of Azure VMs?

Try the following:

# Set your Azure subscription and resource group name
$SubscriptionId = "your-subscription-id"
$ResourceGroupName = "your-resource-group-name"
# Log in to Azure
Connect-AzAccount
# Set the Azure subscription context
Set-AzContext -SubscriptionId $SubscriptionId
# Retrieve all VMs in the specified resource group
$VMs = Get-AzVM -ResourceGroupName $ResourceGroupName
# Loop through each VM and retrieve the creation date
foreach ($VM in $VMs) {
    $VMName = $VM.Name
    # Get the creation date from activity log
    $CreationEvent = Get-AzLog -ResourceGroupName $ResourceGroupName `
                               -ResourceId $VM.Id `
                               -StartTime (Get-Date).AddYears(-1) `
                               -MaxRecord 1 `
                               -DetailedOutput `
                               | Where-Object { $_.OperationName -eq "Microsoft.Compute/virtualMachines/write" -and $_.Status -eq "Succeeded" } `
                               | Sort-Object -Property EventTimestamp `
                               | Select-Object -First 1
    if ($CreationEvent) {
        $CreationDate = $CreationEvent.EventTimestamp
        Write-Output "VM Name: $VMName, Creation Date: $CreationDate"
    } else {
        Write-Output "VM Name: $VMName, Creation Date: Not found"
    }
}

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hth Marcin