powershell 删除7天前的文件

$today=Get-Date
#"今天是：$today"
#昨天
#"昨天是:$($today.AddDays(-1))"
#明天
#"明天是:$($today.AddDays(1))"
#一周前
#"一周前是: $($today.AddDays(-7))"
#五个月前
#"五个月前:$($today.AddMonths(-5))"
#十年之前
#"十年之前:$($today.AddYears(-10).Year)年,我们是朋友."
#日期格式化
#"格式化日期：" + $today.ToString(‘yyyy-MM-dd‘)
$7day=$($today.AddDays(-7).ToString(‘yyyy-MM-dd‘))
#$7day

$localdbdir="D:\database_bak"
$remotedbdir="D:\master_database_bak"
$downonlinefiledir="D:\db_online_bak"

#删除7天前的文件

function delfiles
{
    #布尔类型转换成整数
    $result=Test-Path $_.FullName |foreach { [int] $_ }
    if ($result -eq 1) { 
        del $_.FullName
        "删除文件成功！"
        }
    else{
        "文件不存在"
        break
        }
}
#Test-Path $downwebfiles


function delfile
{
    if($args.Count -eq 0)
    {
        "No argument!"
    }
    else
    {   
          
        $args | foreach { delfiles "$($_)"}
    }
}


function delfilelist
{
    #$args
    if($args.Count -eq 0)
    {
        "No argument!"    
    }
    elseif($args -eq $downonlinefiledir)
    {
    Get-ChildItem -Path $args  -Recurse -ErrorAction SilentlyContinue -Filter *.rar |Where-Object { $_.Extension -eq ‘.rar‘ }|`Where-Object -FilterScript {($_.LastWriteTime -lt $7day) -and ` ($_.PsISContainer -ne $True)} |
    Select-Object FullName|
    ForEach-Object {delfiles $_.FullName}
    }
    else
    {
    Get-ChildItem -Path $args  -Recurse -ErrorAction SilentlyContinue -Filter *.bak |Where-Object { $_.Extension -eq ‘.bak‘ }|`Where-Object -FilterScript {($_.LastWriteTime -lt $7day) -and ` ($_.PsISContainer -ne $True)} |
    Select-Object FullName|
    ForEach-Object {delfiles $_.FullName}
    }
}

delfilelist $localdbdir
delfilelist $remotedbdir
delfilelist $downonlinefiledir