基本上，迭代给定路径下的文件，从当前时间中减去每个文件的CreationTime，并与结果的Days属性进行比较。-WhatIf开关会告诉你在不删除文件的情况下会发生什么(哪些文件将被删除)，删除开关来实际删除文件:

$old = 15
$now = Get-Date

Get-ChildItem $path -Recurse |
Where-Object {-not $_.PSIsContainer -and $now.Subtract($_.CreationTime).Days -gt $old } |
Remove-Item -WhatIf

#----- Define parameters -----#
#----- Get current date ----#
$Now = Get-Date
$Days = "15" #----- define amount of days ----#
$Targetfolder = "C:\Logs" #----- define folder where files are located ----#
$Extension = "*.log" #----- define extension ----#
$Lastwrite = $Now.AddDays(-$Days)

#----- Get files based on lastwrite filter and specified folder ---#
$Files = Get-Childitem $Targetfolder -include $Extension -Recurse | where {$_.LastwriteTime -le "$Lastwrite"}

foreach ($File in $Files)
{
    if ($File -ne $Null)
    {
        write-host "Deleting File $File" backgroundcolor "DarkRed"
        Remove-item $File.Fullname | out-null
    }
    else {
        write-host "No more files to delete" -forgroundcolor "Green"
    }
}

简单地(PowerShell V5)

Get-ChildItem "C:\temp" -Recurse -File | Where CreationTime -lt  (Get-Date).AddDays(-15)  | Remove-Item -Force

Esperento57脚本在较旧的PowerShell版本中无法运行。这个例子是:

Get-ChildItem -Path "C:\temp" -Recurse -force -ErrorAction SilentlyContinue | where {($_.LastwriteTime -lt  (Get-Date).AddDays(-15) ) -and (! $_.PSIsContainer)} | select name| Remove-Item -Verbose -Force -Recurse -ErrorAction SilentlyContinue

另一种方法是从当前日期减去15天，并将CreationTime与该值进行比较:

$root  = 'C:\root\folder'
$limit = (Get-Date).AddDays(-15)

Get-ChildItem $root -Recurse | ? {
  -not $_.PSIsContainer -and $_.CreationTime -lt $limit
} | Remove-Item

如果你在Windows 10系统上使用上述示例有问题，请尝试将. creationtime替换为. lastwritetime。这对我很管用。

dir C:\locationOfFiles -ErrorAction SilentlyContinue | Where { ((Get-Date)-$_.LastWriteTime).days -gt 15 } | Remove-Item -Force