[问题求助] 请教关于文件名删除字符问题

$basename='ABC(2016-12 29)'
$newbasename=[regex]::Replace($basename, '\(([^(]+)\)$', {param($m);([DateTime]$m.groups[1].value).AddDays(-1).ToString('yyyMMdd')})
$newbasename
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7z.exe a -ttar "test.tar" "test.txt"
7z.exe a -tgzip "test.tar.gz" "test.tar"
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Get-ChildItem | Where-Object { $_.Name -match '(.*)\(((?:20|19)\d\d-[01]\d [0-3]\d)\)(.*)' } |
  Rename-Item -NewName `
    { $Matches[1] + ('{00:yyyyMMdd}' -f (Get-Date $Matches[2]).AddDays(-1)) + $Matches[3] }
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