using System;
public class Program
{
public static void Main()
{
string s = string.Format("{0:yyyy-MM-dd HH:mm:ss}", DateTime.Now);
Console.WriteLine(s);
DateTime datetime = DateTime.Now;
s = datetime.ToString("yyyy-MM-dd HH:mm:ss");
Console.WriteLine(s);
Console.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
}
}
/*
run:
2022-03-26 13:58:04
2022-03-26 13:58:04
2022-03-26 13:58:04
*/