using System;

using System.Globalization;             

public class Program

{

    public static void Main()

    {

        var DATE = "May 9, 2020";

        var FORMAT = "MMM d, yyyy";

        Console.WriteLine("FORMATTED DATE:");

        Console.WriteLine(DateTime.ParseExact(DATE,FORMAT, DateTimeFormatInfo.InvariantInfo).ToString("yyyy-MM-dd hh:mm:ss"));

    }

}