DateTime & TimeZoneInfo

static void Main(string[] args)
        {
            //http://stackoverflow.com/questions/1987824/c-sharp-synchronizing-different-time-zones
            //http://stackoverflow.com/questions/179940/c-sharp-convert-utc-gmt-time-to-local-time
            //http://stackoverflow.com/questions/576740/get-timezone-from-datetime
 
            // local time(in my case it is GMT + 5:30)
            var localTime = DateTime.Now;
            var localTime1 = TimeZoneInfo.ConvertTime(localTime, TimeZoneInfo.Local);
            
            //GMT(in my case it is Local - 5:30)
            var utcTime = localTime.ToUniversalTime();
            var utcTime1 = TimeZoneInfo.ConvertTimeToUtc(localTime, TimeZoneInfo.Local);
            var utcTime2 = TimeZoneInfo.ConvertTimeToUtc(localTime);
            var localTime2 = TimeZoneInfo.ConvertTimeFromUtc(utcTime2, TimeZoneInfo.Local);
 
            // If u receive this from other system, and knows it is UTC
            var receivedUtc = DateTime.SpecifyKind(utcTime, DateTimeKind.Utc);
 
            // .Parse thinks it is UTC(as it ends with Z), though it is local - it adds 5:30
            var localTimeParsedFromZ = DateTime.Parse(localTime.ToString("u"));
            
            //We say it is UTC, so when we use .ToLocalTime, it is really 11 hours added to local time
            var localTimeParsedFromZWithKind = DateTime.SpecifyKind(localTimeParsedFromZ, DateTimeKind.Utc); 
            
 
            Console.WriteLine("local time = " + localTime.ToString());
            Console.WriteLine("local time = local time 1 is " + localTime.Equals(localTime1));
            Console.WriteLine("local time = local time 2 is " + localTime.Equals(localTime2));
            Console.WriteLine("localTime.ToString(u) = " + localTime.ToString("u"));
 
            Console.WriteLine("Time Parsed from 'localTime.ToString(u)' = " + localTimeParsedFromZ.ToString());
 
            Console.WriteLine("local time = " + localTimeParsedFromZWithKind.ToLocalTime().ToString());
            
            Console.WriteLine("utc time = " + utcTime.ToString());
            Console.WriteLine("utc time = utc time 1 is " + utcTime.Equals(utcTime1));
            Console.WriteLine("utc time = utc time 2 is " + utcTime.Equals(utcTime2));
            Console.WriteLine("local time from utc = " + utcTime.ToLocalTime().ToString());
            
            Console.WriteLine("received utc = " + receivedUtc.ToString());
            Console.WriteLine("receivedUtc.ToString(u) = " + receivedUtc.ToString("u"));

            foreach (TimeZoneInfo timeZone in TimeZoneInfo.GetSystemTimeZones())
                Console.WriteLine(timeZone.Id);

            var est = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time");
            var pst = TimeZoneInfo.FindSystemTimeZoneById("Pacific Standard Time");
            var estLocal = TimeZoneInfo.ConvertTime(localTime, est);
            var pstLocal = TimeZoneInfo.ConvertTime(localTime, pst); 

         }