‫اصلاح daylight saving time ویندوز تا 90 سال بعد

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\Iran Standard Time]

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\Iran Standard Time]
"Display"="(GMT+03:30) Tehran"
"Dlt"="Iran Daylight Time"
"Std"="Iran Standard Time"
"MapID"="-1,72"
"Index"=dword:000000a0
"TZI"=hex:2e,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,09,00,04,00,03,00,17,00,3b,\
  00,3b,00,00,00,00,00,03,00,02,00,03,00,17,00,3b,00,3b,00,00,00

using System.Runtime.InteropServices;

namespace TimeZoneInfo.Core
{
    [StructLayout(LayoutKind.Sequential)]
    public struct TZI
    {
        public int Bias;
        public int StandardBias;
        public int DaylightBias;
        public SystemTime StandardDate;
        public SystemTime DaylightDate;
    }
}

using System;
using System.Runtime.InteropServices;

namespace TimeZoneInfo.Core
{
    [StructLayoutAttribute(LayoutKind.Sequential)]
    public struct SystemTime
    {
        public short Year;
        public short Month;
        public short DayOfWeek;
        public short Day;
        public short Hour;
        public short Minute;
        public short Second;
        public short Milliseconds;
    }
}

2C 01 00 00 00 00 00 00
C4 FF FF FF 00 00 0A 00
00 00 05 00 02 00 00 00
00 00 00 00 00 00 04 00
00 00 01 00 02 00 00 00
00 00 00 00

(little-endian)   => (big-endian)
  2C 01 00 00     => 00 00 01 2C = 300 Bias
  00 00 00 00     => 00 00 00 00 = 0 Std Bias
  C4 FF FF FF     => FF FF FF C4 = 4294967236 Dlt Bias
( SYSTEM TIME ) StandardDate
  00 00           => 00 00 = Year
  0A 00           => 00 0A = Month
  00 00           => 00 00 = Day of Week
  05 00           => 00 05 = Day
  02 00           => 00 02 = Hour
  00 00           => 00 00 = Minutes
  00 00           => 00 00 = Seconds
  00 00           => 00 00 = Milliseconds
( SYSTEM TIME ) DaylightDate
  00 00           => 00 00 = Year
  04 00           => 00 04 = Month
  00 00           => 00 00 = Day of Week
  01 00           => 00 01 = Day
  02 00           => 00 02 = Hour
  00 00           => 00 00 = Minutes
  00 00           => 00 00 = Seconds
  00 00           => 00 00 = Milliseconds

        public static SystemTime ToSystemTime(DateTime time)
        {
            var result = new SystemTime
            {
                Year = 0, // سال نسبی وارد می‌شود نه مطلق
                Month = (short)time.Month,
                DayOfWeek = (short)time.DayOfWeek,
                Hour = (short)time.Hour,
                Minute = (short)time.Minute,
                Second = (short)time.Second,
                Milliseconds = (short)time.Millisecond
            };

            int weekdayOfMonth = 1; // شماره هفته است نه شماره روز
            for (int dd = time.Day; dd > 7; dd -= 7)
                weekdayOfMonth++;

            result.Day = (short)weekdayOfMonth;

            return result;
        }

using System;
using System.Runtime.InteropServices;

namespace TimeZoneInfo.Core
{
    public static class ByteUtils
    {
        public static Byte[] SerializeByteArray<T>(T msg) where T : struct
        {
            int objsize = Marshal.SizeOf(typeof(T));
            Byte[] ret = new Byte[objsize];

            IntPtr buff = Marshal.AllocHGlobal(objsize);
            Marshal.StructureToPtr(msg, buff, true);
            Marshal.Copy(buff, ret, 0, objsize);
            Marshal.FreeHGlobal(buff);

            return ret;
        }
    }
}