Imported Upstream version 6.0.0.310

Former-commit-id: 4920e33be349109f038445814407a4de396c82a8

mcs/class/corlib/System/TimeZoneInfo.cs

@@ -1236,6 +1236,12 @@ namespace System
 						isDst = true;
 					}
 
+					if (date >= new DateTime (tEnd.Ticks - current.DaylightDelta.Ticks, DateTimeKind.Utc))
+					{
+						offset = baseUtcOffset;
+						isDst = false;
+					}
+
 					return true;
 				}
 			}