Powershell: powershell删除N天前的文件

在C:\Users\Administrator\Desktop\temp1目录下随机建5个2019年前的文件并把他们删除。：）

$path="C:\Users\Administrator\Desktop\temp1"
for ($i=1;$i -le 5)
{
$year1=201
$year2= Get-Random -Minimum 0 -Maximum 8
$year="$year1$year2"
$month= Get-Random -Minimum 1 -Maximum 12
$day= Get-Random -Minimum 1 -Maximum 28
$filelastwite=[datetime]::Parse("$year-$month-$day")
$filelastwite
$filename=-join ([char[]](97..122)| Get-Random -Count 5)
(New-Item -name $filename -Path $path -ItemType file).LastWriteTime=$filelastwite
$i++
}
Write-Host "以下文件将会被删除！"
(Get-ChildItem -Path $path |where {$_.LastWriteTime -le (get-date).adddays(-3) -and $_ -is [System.IO.FileInfo]}).fullname
(Get-ChildItem -Path $path |where {$_.LastWriteTime -le (get-date).adddays(-3) -and $_ -is [System.IO.FileInfo]}).fullname|Remove-Item