private void ShowRange(string from, string to)
        {
            DateTime date1 = StringToDateConverter(from);
            DateTime date2 = StringToDateConverter(to);

            query.ShowRange(date1, date2).ForEach(x =>
            {
                Console.WriteLine("{0} {1}: {2} szt.", x.Date, x.NameOfRecipe, x.SumOfPreparedBatches);
            });

            //Console.WriteLine(date1.ToString());
            //Console.WriteLine(date2.ToString());
        }