using System;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        DateTime dateInput = new DateTime(2018, 03, 11, 2, 30, 0);

        TimeZoneInfo timeZoneInput = TimeZoneInfo.FindSystemTimeZoneById("Central Standard Time");

        if (timeZoneInput.SupportsDaylightSavingTime && timeZoneInput.IsInvalidTime(dateInput)) {

            Console.Write("Invalid Date/Time! ");

            dateInput = dateInput.AddHours(Math.Abs(timeZoneInput.GetUtcOffset(dateInput).Hours));

        } else if (timeZoneInput.SupportsDaylightSavingTime && timeZoneInput.IsAmbiguousTime(dateInput)) {

            Console.Write("Ambiguous Date/Time! ");

            dateInput = dateInput.AddHours(Math.Abs(timeZoneInput.GetUtcOffset(dateInput).Hours));

        }

        else {

            Console.Write("Valid Date/Time! ");

        //  DateTime.TryParse(dateInput.ToString(), new CultureInfo("en-US"), DateTimeStyles.None, out DateTime stuff);

        //  dateInput = stuff.ToUniversalTime();

        }

        Console.WriteLine(dateInput);

​

    }

}