using System;

public class Program

{

    public static void Main()

    {

        var first = new DateTime(2022, 10, 30, 11, 45, 34, 555);

        Console.WriteLine(first.ToString("yyyy-MM-dd HH:mm:ss.fff"));

        var second = first.Date;

        Console.WriteLine(second.ToString("yyyy-MM-dd HH:mm:ss.fff"));

        var third = new DateTime(second.Year, second.Month, second.Day);

        Console.WriteLine(third.ToString("yyyy-MM-dd HH:mm:ss.fff"));

    }

}