[[enecumene]]

Hola, intentalo de esta manera:

Código Delphi [-]
procedure TFormprincipal.Button1Click(Sender: TObject);
begin
try
with formre do
formre.ADOQuery1.SQL.Add('WHERE (((incidencias.fechainicio) Between :dia1 And :dia2))');
formre.ADOQuery1.Params.ParamByName('dia1').value := DateTimePicker1.Date;
formre.ADOQuery1.Params.ParamByName('dia2').value := DateTimePicker2.Date;
formre.ADOQuery1.Open;
formre.QuickRep1.Preview;
{formre.DataSetre.Last;}
Finally
formre.QuickRep1.Free;
formre.ADOQuery1.Last;
{formre.ADOQuery1.Close;}
end;
end;

Espero que te ayude

Saludos.