private void button1_Click(object sender, EventArgs e)
        {
            DateTime aaa = Convert.ToDateTime("01.01.2023");
            DateTime dt = date.Value;
            int day = dt.Year;
            textBox2.Text = day.ToString();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            DateTime dt = Convert.ToDateTime(textBox1.Text);
            date.Value = dt;
        }