diff --git a/ComplexProperties/TimeZones/TimeZoneTransitionGroup.cs b/ComplexProperties/TimeZones/TimeZoneTransitionGroup.cs
index 57b88b76..3aa99306 100644
--- a/ComplexProperties/TimeZones/TimeZoneTransitionGroup.cs
+++ b/ComplexProperties/TimeZones/TimeZoneTransitionGroup.cs
@@ -127,7 +127,7 @@ internal virtual void InitializeFromAdjustmentRule(AdjustmentRule adjustmentRule
                 standardPeriodToSet.Id = string.Format(
                     "{0}/{1}",
                     standardPeriod.Id,
-                    adjustmentRule.DateStart.Year);
+                    adjustmentRule.DateSTart.ToString("yyyyMMdd"));
                 standardPeriodToSet.Name = standardPeriod.Name;
                 standardPeriodToSet.Bias = standardPeriod.Bias;
                 this.timeZoneDefinition.Periods.Add(standardPeriodToSet.Id, standardPeriodToSet);
@@ -143,7 +143,7 @@ internal virtual void InitializeFromAdjustmentRule(AdjustmentRule adjustmentRule
                 daylightPeriod.Id = string.Format(
                     "{0}/{1}",
                     TimeZonePeriod.DaylightPeriodId,
-                    adjustmentRule.DateStart.Year);
+                    adjustmentRule.DateSTart.ToString("yyyyMMdd"));
                 daylightPeriod.Name = TimeZonePeriod.DaylightPeriodName;
                 daylightPeriod.Bias = standardPeriod.Bias - adjustmentRule.DaylightDelta;
 
@@ -158,7 +158,7 @@ internal virtual void InitializeFromAdjustmentRule(AdjustmentRule adjustmentRule
                 standardPeriodToSet.Id = string.Format(
                     "{0}/{1}",
                     standardPeriod.Id,
-                    adjustmentRule.DateStart.Year);
+                    adjustmentRule.DateSTart.ToString("yyyyMMdd"));
                 standardPeriodToSet.Name = standardPeriod.Name;
                 standardPeriodToSet.Bias = standardPeriod.Bias;
                 this.timeZoneDefinition.Periods.Add(standardPeriodToSet.Id, standardPeriodToSet);
diff --git a/Core/EwsHttpWebRequest.cs b/Core/EwsHttpWebRequest.cs
index 65a9c7b1..23827187 100644
--- a/Core/EwsHttpWebRequest.cs
+++ b/Core/EwsHttpWebRequest.cs
@@ -107,7 +107,7 @@ public async Task<IEwsHttpWebResponse> GetResponse(CancellationToken token)
             HttpResponseMessage response = null;
             try
             {
-                response = await _httpClient.SendAsync(message, token);
+                response = await _httpClient.SendAsync(message, HttpCompletionOption.ResponseHeadersRead., token);
             }
             catch(Exception exception)
             {