>>80
これでいいよ
下手に汎用性もたせようとするとそんな風に失敗してるものができる

ls -file | where name -match "Screenshot_(\d{4})(\d{2})(\d{2})-(\d{2})(\d{2})(\d{2})" |
foreach { $_.CreationTime = $_.LastWriteTime = "{0}/{1}/{2} {3}:{4}:{5}" -f $Matches[1..6]; $_ }
read-host "何かキーを押すと終了"