Renames folders with the last write time of their most recent files

renameFoldersWithItsLastEditDates.ps1

'-------------------------------------------------------------------------------------------------'
' renameFoldersWithItsLastEditDates (2020-11-08)                                                  '
' Renames folders with the last write time of their most recent files                             '
' [directoryName] -> [directoryName]_[YYYYMMDD-HHmmss]                                            '
'-------------------------------------------------------------------------------------------------'
Set-ExecutionPolicy Unrestricted -Scope CurrentUser
$erroractionpreference = "SilentlyContinue"; Remove-Variable *; $erroractionpreference = "Continue"


$pathWithFoldersToRename = "c:\FoldersToRename\"


Write-Host "Renaming folders in $pathWithFoldersToRename..."
$cnt = 0
foreach ($item in (Get-ChildItem $pathWithFoldersToRename -Directory -Force))
{
    $dtRecent = (Get-ChildItem $item.FullName -Recurse -File -Force `
        | Sort LastWriteTime | Select -Last 1).LastWriteTime
    $newName = "$($dtRecent.ToString('yyyyMMdd-HHmmss'))_$($item.Name)"
    Rename-Item $item.FullName -NewName $newName
    $cnt++
}
Write-Host "Ready! $cnt folders renamed"
'-------------------------------------------------------------------------------------------------'