using System;
public class Test
{
public static void Main()
{
var dateTime = new DateTime(2018, 04, 26);
const string dateFormat = "dd MMM yyyy HH:mm:ss:fff";
var dtExact = DateTime.ParseExact(
dateTime.ToString(dateFormat)
, dateFormat
, null
);
Console.WriteLine("{0:dd MMM yyyy HH:mm:ss:fff}\n{1:dd MMM yyyy HH:mm:ss:fff}", dateTime, dtExact);
}
}
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