Gets a list of Key Vaults from the currently selected subscription

Get-AzureKeyVaults.ps1

$vaults = az resource list --resource-type Microsoft.KeyVault/vaults | convertfrom-json
$managedHsms = az resource list --resource-type Microsoft.KeyVault/managedHSMs | convertfrom-json
$lookup = $vaults + $managedHsms | group id -asstring -ashashtable

function get-delta ($dt) {
    if ($dt -ge [datetime]::now.adddays(-1)) {
        '<= 1d'
    } elseif ($dt -ge [datetime]::now.adddays(-7)) {
        '<= 7d'
    } elseif ($dt -ge [datetime]::now.adddays(-30)) {
        '<= 30d'
    } elseif ($dt -ge [datetime]::now.adddays(-90)) {
        '<= 90d'
    } else {
        '> 90d'
    }
}

az keyvault list --query '[].{name: name, id: id, sku: sku.name, type: type}' | convertfrom-json | foreach {
    $created = get-delta $lookup[$_.id].createdTime
    $changed = get-delta $lookup[$_.id].changedTime

    $_ | add-member -name created -type noteproperty -value $created -passthru `
       | add-member -name changed -type noteproperty -value $changed -passthru
}