c#显示24小时制时间

/// <summary>
/// Program类
/// </summary>
class Program
{
    /// <summary>
    /// 程序入口
    /// </summary>
    /// <param name="args">参数数组</param>
    static void Main(string[] args)
    {
        DateTime dt = DateTime.ParseExact("2018/09/17 13:22:11", "yyyy/MM/dd HH:mm:ss", null);

        Console.WriteLine(Environment.NewLine);
        Console.WriteLine(dt.ToString("yyyy-MM-dd HH:mm:ss")); //24小时制
        Console.WriteLine(Environment.NewLine);
        Console.WriteLine(dt.ToString("yyyy-MM-dd hh:mm:ss")); //12小时制
        Console.ReadKey();
    }
}