Powershell / Azure Automation / Delete older Containers from Azure Storage Account

$ConnectionAssetName = "AzureClassicRunAsConnection"

#DESCRIPTION: Example of using Classic Run As Account (certificate) and then Delete older containers from storage accounts
#AUTHOR: Zoran Barac

$ConnectionAssetName = "AzureClassicRunAsConnection"

# Get the connection
$connection = Get-AutomationConnection -Name $connectionAssetName

# Authenticate to Azure with certificate
Write-Verbose "Get connection asset: $ConnectionAssetName" -Verbose
$Conn = Get-AutomationConnection -Name $ConnectionAssetName
if ($Conn -eq $null)
{
throw "Could not retrieve connection asset: $ConnectionAssetName. Assure that this asset exists in the Automation account."
}

$CertificateAssetName = $Conn.CertificateAssetName
Write-Verbose "Getting the certificate: $CertificateAssetName" -Verbose
$AzureCert = Get-AutomationCertificate -Name $CertificateAssetName
if ($AzureCert -eq $null)
{
throw "Could not retrieve certificate asset: $CertificateAssetName. Assure that this asset exists in the Automation account."
}
Write-Verbose "Authenticating to Azure with certificate." -Verbose
Set-AzureSubscription -SubscriptionName $Conn.SubscriptionName -SubscriptionId $Conn.SubscriptionID -Certificate $AzureCert -CurrentStorageAccount "YourSorageAccount"
Select-AzureSubscription -SubscriptionId $Conn.SubscriptionID

#List all containers for your storage account
$containers = New-AzureStorageContext -StorageAccountName "YourSorageAccount" -StorageAccountKey "YourStorageAccountKey"

#Set date limit
$isOldDate = [DateTime]::UtcNow.AddDays(-3)

#Delete all containers older than limit
Get-AzureStorageContainer -Context $containers | Where-Object { $_.LastModified.UtcDateTime -lt $isOldDate} | Remove-AzureStorageContainer -Force