C# Online Compiler | .NET Fiddle

using System;
					
public class Program
{
	public static void Main()
	{	
		DateTime specifiedTime = new DateTime(2017, 04, 02, 18, 51, 00);
		DateTime now = DateTime.Now;
		
		string timeName = null;
		try
		{
			// specify the TimeZone we're wanting to validate against
   			TimeZoneInfo zone = TimeZoneInfo.FindSystemTimeZoneById("New Zealand Standard Time");
			
			// check whether the selected TimeZone is subject to Daylight Savings Time; assign correct name to the zone
			if (zone.IsDaylightSavingTime(specifiedTime))
			{
				timeName = zone.DaylightName;
			}
			else
			{
				timeName = zone.StandardName;
			}
			
			// convert specified time to UTC for comparison
			DateTime specifiedTimeAsUtc = TimeZoneInfo.ConvertTime(specifiedTime, zone, TimeZoneInfo.Local);			
   			Console.WriteLine("Specified date/time converted to UTC for comparison:\r\n{0} {1} = {2} UTC.", specifiedTime, timeName, specifiedTimeAsUtc);
			
			// compare specified time in UTC to current DateTime in UTC, ascertain whether it falls before or after DateTime.Now
			Console.Write("Specified time in UTC compared to current Date/Time in UTC:\r\n");
			if (specifiedTimeAsUtc < now)
			{
				Console.Write("{0} < {1}\r\n", specifiedTimeAsUtc, now);
			}
			else if (specifiedTimeAsUtc == now)
			{
				Console.Write("{0} = {1}\r\n", specifiedTimeAsUtc, now);
			}
			else
			{
				Console.Write("{0} > {1}\r\n", specifiedTimeAsUtc, now);
			}
		}
		catch (TimeZoneNotFoundException tznfe) // typically a typo in row 14, TimeZoneInfo.FindSystemTimeZoneById()
		{
			Console.WriteLine(tznfe.Message);
		}                           
		catch (InvalidTimeZoneException itze) // this is thrown due corrupted Registry TimeZone data
		{
			Console.WriteLine(itze.Message);
		}
		finally
		{
			DisplayAllValidTimeZones();
		}
	}
	
	// get all TimeZone data stored in the Registry and display the Id for each as well as the base UTC offset we're using for comparison
	public static void DisplayAllValidTimeZones()
	{
		Console.WriteLine("\r\nALL VALID TIMEZONES FROM SYSTEM REGISTRY (with base UTC offset)\r\n");
		
		foreach (TimeZoneInfo z in TimeZoneInfo.GetSystemTimeZones())
		{
			Console.WriteLine("{0}, {1}", z.Id, z.BaseUtcOffset);
		}
	}
}

 
using System;
                    
public class Program
{
    public static void Main()
    {   
        DateTime specifiedTime = new DateTime(2017, 04, 02, 18, 51, 00);
        DateTime now = DateTime.Now;
        
        string timeName = null;
        try
        {
            // specify the TimeZone we're wanting to validate against
            TimeZoneInfo zone = TimeZoneInfo.FindSystemTimeZoneById("New Zealand Standard Time");
            
            // check whether the selected TimeZone is subject to Daylight Savings Time; assign correct name to the zone
            if (zone.IsDaylightSavingTime(specifiedTime))
            {
                timeName = zone.DaylightName;
            }
            else
            {
                timeName = zone.StandardName;
            }

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