System.TimeZoneInfo.GetAdjustmentRules C# (CSharp) Method

		public AdjustmentRule [] GetAdjustmentRules ()
		{
			if (!supportsDaylightSavingTime || adjustmentRules == null)
				return new AdjustmentRule [0];
			else
				return (AdjustmentRule []) adjustmentRules.Clone ();
		}

 public static void FixTimeZoneDSTRRules (TimeZoneInfo tz, ITimeZone iCalTz)
 {
   var adjustments = tz.GetAdjustmentRules();
   foreach (var tziItems in iCalTz.TimeZoneInfos)
   {
     var matchingAdj = adjustments.FirstOrDefault(a => (a.DateStart.Year == tziItems.Start.Year)) ?? adjustments.FirstOrDefault();
     if (matchingAdj != null)
     {
       if ((matchingAdj.DateEnd.Year != 9999) && !(tziItems.Name.Equals("STANDARD") && matchingAdj == adjustments.Last()))
       {
         tziItems.RecurrenceRules[0].Until =
           DateTime.SpecifyKind(matchingAdj.DateEnd.Date.AddDays(1).Subtract(tz.BaseUtcOffset), DateTimeKind.Utc);
       }
       if (tziItems.Name.Equals("STANDARD"))
       {
         if (!matchingAdj.DaylightTransitionEnd.IsFixedDateRule)
         {
           var startYear = tziItems.Start.Year;
           tziItems.Start = CalcTransitionStart(matchingAdj.DaylightTransitionEnd, startYear);
         }
       }
       else
       {
         if (!matchingAdj.DaylightTransitionStart.IsFixedDateRule)
         {
           var startYear = tziItems.Start.Year;
           tziItems.Start = CalcTransitionStart(matchingAdj.DaylightTransitionStart, startYear);
         }
       }
     }
   }
 }