using System;
using System.Globalization;
using System.Threading;

namespace NowTest
{
    class Program
    {
        static void Main(string[] args)
        {
            //run forever
            while (true)
            {
                Console.WriteLine("-----------------------------------------------");
                //Print some DateTime.Net information
                Console.WriteLine("DateTime.Now: {0}", DateTime.Now);
                CultureInfo.CurrentCulture.ClearCachedData();
                Console.WriteLine("Cleared: DateTime.Now: {0}", DateTime.Now);
                Console.WriteLine("UTC+Offset: {0}", GetLocalTime());
                
                var currTimeZone = TimeZone.CurrentTimeZone;
                var now = DateTime.Now;
                var dstInfo = currTimeZone.GetDaylightChanges(now.Year);
                var inDST = currTimeZone.IsDaylightSavingTime(now);
                var offset = currTimeZone.GetUtcOffset(now);
                var utcDateTime = DateTime.UtcNow;

                //Print some more information for fun
                Console.WriteLine("{0} - Start: {1}:{2} - End: {3}:{4} - {5}", now.Ticks, dstInfo.Start, dstInfo.Start.Ticks, dstInfo.End, dstInfo.End.Ticks, inDST);
                
                //If I do the match for the ticks, let's see if we are following everything correctly
                if (now.Ticks > dstInfo.Start.Ticks)
                {
                    Console.WriteLine(now.Ticks > dstInfo.End.Ticks ? "Not in DST" : "In DST");
                }

                Console.WriteLine("UTC: {0} - Offset: {1}", utcDateTime.ToString(CultureInfo.InvariantCulture), offset.ToString());
                Console.WriteLine("-----------------------------------------------{0}", Environment.NewLine);
                //Print every 5 seconds for kicks
                Thread.Sleep(5000);
            }
            
        }

        //return the local time using UTC offset and UTC Now
        static DateTime GetLocalTime()
        {
            //Try to clear the cache and see if that helps...
            System.Globalization.CultureInfo.CurrentCulture.ClearCachedData();
            return (DateTime.UtcNow + TimeZone.CurrentTimeZone.GetUtcOffset(DateTime.Now));
        }
    }
}