public static TimeChangeType GetTimeChange(DateTime time)
{
if (time.Date == TimeZone.CurrentTimeZone.GetDaylightChanges(time.Year).Start.Date) return TimeChangeType.SummerTime;
else
if (time.Date == TimeZone.CurrentTimeZone.GetDaylightChanges(time.Year).End.Date) return TimeChangeType.WinterTime;
else return TimeChangeType.Unchanged;
}