Test date/time bug, C#

Test date/time bug

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
                       
            // New issue
            //var dateMeeting = new DateTime(2018, 11, 27);
            Console.WriteLine("When MeetingDate the same as original and RaceDate should be the next day");
            var dateMeeting = GetUtcDateTime("121218", "1400");                
            Console.WriteLine("DateMeeting should be: 12.12.2018 00:00:00, have: " + dateMeeting.Date);            
            var raceDate = GetUtcDateTime(dateMeeting, "2000");
            var raceDateLegacy = GetUtcDateTimeLegacy(dateMeeting.ToString("ddMMyy"), "2000");
            Console.WriteLine("RaceDate should be: 13.12.2018 01:00:00, have: " + raceDate + ", legacy: " + raceDateLegacy + "\n\n");     
            
            Console.WriteLine("When MeetingDate is not the same as original and RaceDate shouldn't be the next day");
            var dateMeeting2 = GetUtcDateTime("121218", "1900");                
            Console.WriteLine("DateMeeting should be: 13.12.2018 00:00:00, have: " + dateMeeting2.Date);            
            var raceDate2 = GetUtcDateTime(dateMeeting2, "2000");
            var raceDateLegacy2 = GetUtcDateTimeLegacy(dateMeeting2.ToString("ddMMyy"), "2000");
            Console.WriteLine("RaceDate should be: 13.12.2018 01:00:00, have: " + raceDate2 + ", legacy: " + raceDateLegacy2 + "\n\n");     
            
            Console.WriteLine("When MeetingDate the same as original and RaceDate shouldn't be the next day");
            var dateMeeting3 = GetUtcDateTime("121218", "1500");                
            Console.WriteLine("DateMeeting should be: 12.12.2018 00:00:00, have: " + dateMeeting3.Date);            
            var raceDate3 = GetUtcDateTime(dateMeeting3, "1700");
            var raceDateLegacy3 = GetUtcDateTimeLegacy(dateMeeting3.ToString("ddMMyy"), "1700");
            Console.WriteLine("RaceDate should be: 12.12.2018 22:00:00, have: " + raceDate3 + ", legacy: " + raceDateLegacy3 + "\n\n");    
           
        }

private static DateTime GetUtcDateTime(DateTime meetingDate, string time, bool timeWithSeconds = false)
        {
            var dateTimeFormat = timeWithSeconds ? "HHmmss" : "HHmm";

var temporaryDate = meetingDate;

var timeInSpecificTimeZone = DateTime.ParseExact(
                ConvertTimeToCommonFormat(time), dateTimeFormat,
                CultureInfo.InvariantCulture);

timeInSpecificTimeZone = ConvertToUtc(timeInSpecificTimeZone);

var timeFromTrni = int.Parse(time.Substring(0, 2));

if(timeInSpecificTimeZone.Hour < timeFromTrni){
                temporaryDate = temporaryDate.AddDays(1);
            }

return new DateTime(temporaryDate.Year,
                temporaryDate.Month,
                temporaryDate.Day,
                timeInSpecificTimeZone.Hour,
                timeInSpecificTimeZone.Minute,
                timeInSpecificTimeZone.Second);
        }
        
        private static DateTime GetUtcDateTime(string date, string time, bool timeWithSeconds = false)
        {
            var dateTimeFormat = timeWithSeconds ? "ddMMyyHHmmss" : "ddMMyyHHmm";

var datetime = date + ConvertTimeToCommonFormat(time);
            var dateTimeInSpecificTimeZone = DateTime.ParseExact(
                datetime, dateTimeFormat,
                CultureInfo.InvariantCulture);

return ConvertToUtc(dateTimeInSpecificTimeZone);
        }
        
        private static DateTime GetUtcDateTimeLegacy(string date, string time, bool timeWithSeconds = false)
        {
             var dateTimeFormat = timeWithSeconds ? "ddMMyyHHmmss" : "ddMMyyHHmm";

var datetime = date + ConvertTimeToCommonFormat(time);
            var resultTime = DateTime.ParseExact(
                datetime, dateTimeFormat,
                CultureInfo.InvariantCulture);
            resultTime = DateTime.SpecifyKind(resultTime, DateTimeKind.Utc);
            var tzi = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");
            resultTime = resultTime.AddTicks(tzi.GetUtcOffset(DateTime.UtcNow).Ticks * -1);

return resultTime;
        }
        
        public static DateTime ConvertToUtc(DateTime dateTimeInSpecificTimeZone){
            var tzi = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");

return DateTime.SpecifyKind(dateTimeInSpecificTimeZone, DateTimeKind.Utc).AddTicks(tzi.GetUtcOffset(DateTime.UtcNow).Ticks * -1);
        }

public static string ConvertTimeToCommonFormat(string time)
        {
            if (time.StartsWith("24"))
            {
                time = "00" + time.Substring(2);
            }

return time;
        }
    }
}


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