Order1 => 'xlAscending',

...
#use strict; # deaktiviert wegen Excel-Sortierung
use Net::LDAP;
use Date::Calc qw(Delta_Days Today);
use Win32::OLE;
use Win32::OLE::Const 'Microsoft Excel';

$Win32::OLE::Warn = 3; #Fehler genau ausgeben

...

#########
#
# Methode die Excel-Datei erzeugt
##
sub createExcel {

    # Lokale Variaben:
    my @toDo = @_;
    my $EVAL_ERROR;
    my $excel;
    my $book;
    my $sheet;

    showLine();
    print "FUNCTION createExcel\n";

    print "Try to open Excel.\n";

    # falls Instanz von Excel schon läuft benutze diese:
    eval {$excel = Win32::OLE->GetActiveObject('Excel.Application')};
    return 1 if $EVAL_ERROR;

    #wenn $excel noch nichts zugewiesen starte Excel:
    unless (defined $excel) {
        $excel = Win32::OLE->new('Excel.Application')   #, sub {$_[0]->Quit;}
        or return 1;
    }
    print "Excel ok.\n";

    # Excel sichtbar/unsichtbar machen
    $excel->{Visible} = 1;
    
    # Alerts vertecken (0=verstecken)
    $excel->{DisplayAlerts} = 0;

    # Erzeuge leere Tabelle:
    $book = $excel->Workbooks->Add;
    $sheet = $book->Worksheets(1);

    print "Write to File. \n";

    my $length = @toDo;
    if ($length eq 0) {
        $sheet->Cells(1,1)->{Value} = "Keine passenden Einträge gefunden!";
    }
    else {
        # Kopfzeile einfügen:
        $sheet->Cells(1,1)->{Value} = "Last Login";
        $sheet->Cells(1,2)->{Value} = "Days";
        $sheet->Cells(1,3)->{Value} = "Fullname";
        $sheet->Cells(1,4)->{Value} = "Context";
        $sheet->Range('A1:E1')->Font->{Bold}=1;
        $sheet->Range('A1:E1')->Font->{ColorIndex}=2;
        $sheet->Range('A1:E1')->Interior->{ColorIndex}=5;

        # Werte eintragen
        for (my $i=0; $i<$length; $i++) {
            $sheet->Cells($i+2,1)->{Value} = $toDo[$i][0];
            $sheet->Cells($i+2,2)->{Value} = $toDo[$i][1];
            $sheet->Cells($i+2,3)->{Value} = $toDo[$i][2];
            $sheet->Cells($i+2,4)->{Value} = $toDo[$i][3];
        }
        
        # Breite anpassen:
        my @columns = qw(C:D);
        foreach my $range (@columns) {
            $sheet->Columns($range)->AutoFit();
        }
        
        # Sortieren
        my $excelLength = $length + 1;
        $sheet->Range("A2:D$excelLength")->Sort({
            Key1 => $sheet->Range("a1"),
            Order1 => xlDescending
        })
    }
    return 0;
}