Get-S3FolderLastModified

Get-S3FolderLastModified.ps1

function Get-S3FolderLastModified {
    param(
        [parameter(mandatory=$true)]
        [string]$folder,
        [parameter(mandatory=$true)]
        [string]$bucket,
        [parameter(mandatory=$true)]
        [string]$region
    )
    
    $objects = Get-S3Object -BucketName $bucket -Region $region -KeyPrefix $folder
    $folders = $objects | %{(Split-Path $_.key) -replace '\\','/'} | select -Unique

    $folders | %{
       $folder = $_
        $objectsInThisFolder = $objects | ?{$_.key -match "$( [Regex]::Escape($folder))\/[^\/]*$"}    
        $MostRecentObject = $objectsInThisFolder | Sort-Object LastModified | select -last 1
        New-Object psobject -Property @{Folder=$folder;"LastModified"=$MostRecentObject.LastModified}

    }
}