$web = Get-SPWeb "http://s01-dv01:15000/Group"
$Libraries = $web.Lists | where {$_.BaseType -eq "DocumentLibrary" -And $_.Title -eq "LibraryName" -and -not $_.hidden }
 
foreach ($library in $Libraries) {
 
    Write-Output "Getting files from $($library.Title)"
    $Files = $library.Items | where {$_.FileSystemObjectType -eq "File"}
    foreach ($file in $Files) {
        Write-Output "Deleting file $($file.Name)..."
        $file.Delete()
    }
}

[System.Reflection.Assembly]::Load("Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c")

$site = new-object Microsoft.SharePoint.SPSite("http://s01-dv01:15000/Group")
$web = $site.OpenWeb("РПС")
$documentLibrary = $web.Lists["Business Studio"]

$yesterdaysDate = [Microsoft.SharePoint.Utilities.SPUtility]::CreateISO8601DateTimeFromSystemDateTime([System.DateTime]::UtcNow.AddYears(-1.0))
$query = new-object Microsoft.SharePoint.SPQuery
$query.ViewFields = "<FieldRef Name='Modified' />"
$query.Query = "<Where><Leq><FieldRef Name='Modified' /><Value Type='DateTime' IncludeTimeValue='TRUE'>" + $yesterdaysDate + "</Value></Leq></Where>"
$queryItems = $documentLibrary.GetItems($query)
foreach ($item in $queryItems)
{
    echo $item.Url
    $item.Delete()
}
$web.Dispose()
$site.Dispose()

$web = Get-SPWeb "http://s01-dv01:15000/Group"
$Libraries = $web.Lists | where {$_.BaseType -eq "DocumentLibrary" -And $_.Title -eq "Обучение" -and -not $_.hidden }
 
foreach ($library in $Libraries) {
 
    Write-Output "Getting files from $($library.Title)"
    $Files = $library.Items | where {$_.FileSystemObjectType -eq "File"  -And ($_.File.TimeCreated -lt (Get-Date).AddYears(-1))  -And ($_.File.ParentFolder.Name -eq "Тесты")}
    foreach ($file in $Files) {
       # Write-Output "$($file.Name), $($file.Length)"
    Write-Output "Deleting file $($file.Name)..."
        $file.Delete()
    }
}