【C#】日付

2025.01.20 DateOnly 型を扱う

private void button1_Click(object sender, EventArgs e)
{
    private void button1_Click(object sender, EventArgs e)
    {
        var date1 = new DateOnly(2025, 1, 19);
        listBox1.Items.Add(date1.ToShortDateString());
    }
}