descobri depois de muita googling
$SubtractDays = New-Object System TimeSpan 1,0,0,0,0
(Get-ChildItem D:\ -Recurse | Where {($_.LastWriteTime).date -eq (Get-Date).date})| ForEach-Object {$_.LastWriteTime = $_.LastWriteTime.Subtract($SubtratDays)}
(Get-ChildItem D:\ -Recurse | Where {($_.CreationTime).date -eq (Get-Date).date})| ForEach-Object {$_.CreationTime = $_.CreationTime.Subtract($SubtratDays)}