Checking time span between two timezone times, C#

Language: Layout:

//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        
        public static DateTime? dateConvertTimeZone(DateTime? tIn, String oldTimeZone, String newTimeZone)
        {
            TimeZoneInfo tziNew;
            TimeZoneInfo tziOld;
            if (tIn == null) return null;
            DateTime t = tIn ?? DateTime.Now;
            try
            {
                tziNew = TimeZoneInfo.FindSystemTimeZoneById(newTimeZone);
            }
            catch (TimeZoneNotFoundException ex)
            {
                tziNew = TimeZoneInfo.Local;
            }

try
            {
                tziOld = TimeZoneInfo.FindSystemTimeZoneById(oldTimeZone);
            }
            catch (TimeZoneNotFoundException ex)
            {
                tziOld = TimeZoneInfo.Local;
            }

try
            {
                return TimeZoneInfo.ConvertTime(t, tziOld, tziNew);
            }
            catch (Exception ex)
            {
                //Logger.Error(string.Format("Exception at Scalarfunction/dateConvertTimeZone:{0} Additional Parameters tziold:{1} tzinew:{2} time to convert:{3}", ex, tziOld, tziNew, t));
                return null;
            }
        }
        
        
        public static void Main(string[] args)
        {
           
            DateTime AutoSignOutTimeinLocal = (DateTime)dateConvertTimeZone(DateTime.Parse("2014-11-24 00:00:00.000"), "AUS Eastern Standard Time", "AUS Eastern Standard Time");
            var currentTime = DateTime.Now;
            
            //TimeSpan tSpan = AutoSignOutTimeinLocal.Subtract(DateTime.Parse("2014-11-27 00:15:00.000"));
            TimeSpan tSpan = AutoSignOutTimeinLocal.Subtract(currentTime);
            
            Console.WriteLine(tSpan.Hours.ToString() + " : "+ tSpan.Minutes.ToString());
            
            if (tSpan.Hours == 0 && tSpan.Minutes > -15)
            {
                Console.WriteLine("Run....");
            }
            else
            {
                Console.WriteLine("Do not Run....");
            }
            
            
            
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0.14 sec, absolute running time: 0.11 sec, cpu time: 0.09 sec, average memory usage: 16 Mb, average nr of threads: 4