Script for deleting 1st and 15th seems not good

PowerShell Help
1

Idea is to delete all files except 1st and 15th at the month.
But when i run it i see files at other days too

$Path = "D:\test"
$Daysback = -15
$CurrentDate = Get-Date
$DatetoDelete = $CurrentDate.AddDays($Daysback)

Get-ChildItem $Path -Recurse |
    ? { ($_.LastWriteTime -lt $DatetoDelete) -and !($_.LastWriteTime.Day -eq 1) -and !($_.LastWriteTime.Day -eq 15)}|Remove-Item  -Recurse -Confirm:$false -Force
2

Try this:

Get-ChildItem $Path -Recurse |
    Where-Object { ($_.LastWriteTime -lt $DatetoDelete) -and -not (($_.LastWriteTime.Day -eq 1) -or ($_.LastWriteTime.Day -eq 15))}|
        Remove-Item  -Recurse -Confirm:$false -Force
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