private void button1_Click(object sender, EventArgs e)
{
MessageBox.Show(DateTime.IsLeapYear(int.Parse(DateTime.Now.ToString("yyyy"))).ToString());
}
2021-11-17 04:56:00
private void button1_Click(object sender, EventArgs e)
{
MessageBox.Show(DateTime.IsLeapYear(int.Parse(DateTime.Now.ToString("yyyy"))).ToString());
}