using System;

using System.Collections.Concurrent;

using System.Collections.Generic;

using System.Text.RegularExpressions;

using System.Linq;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        object logDate = "2020-10-03 06:21:13.480";

        var asStr = logDate.ToString();

        var asDate = DateTime.Parse(asStr);

        Console.WriteLine($"The object: {logDate}");

        Console.WriteLine($"The string: {asStr}");  

        Console.WriteLine($"The datetime: {asDate}");   

        Console.WriteLine($"The formatted datetime: {asDate.ToString("YYYY-MM-dd HH:mm:ss.fff")}"); 

    }

}