PowerShell: Get the first files in each folder for each day

\ by 
$SetFileNames = @()
$TESTFiles | 
    Sort-Object Directory, LastWriteTime, Name | 
        Group-Object -Property {Get-Date $_.LastWriteTime -Format d } |
            ForEach-Object {
                $_.Group |
                    ForEach-Object -Begin {
                        $counter = 0
                        $FirstFile = $_ 
                        # Grab the files for each folder which are the first file of each day.
                        $SetFileNames += $FirstFile.Group[0]
                    } -Process {
                        $counter++;
                        # Do work here
                    }
            }
$SetFileNames
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