private DateTime ComputeDateTimeTimeZoneLocalDateUtc(TimeSpan value)
{
if (CurrentDate.Kind != DateTimeKind.Local)
{
throw new Exception("Invalid CurrentDate DateTimeKind : must be Local");
}
var baseUtcOffset = TimeZone.BaseUtcOffset;
var dateTime = ComputeNewDateTime(value);
if (TimeZone.SupportsDaylightSavingTime)
{
if (TimeZone.IsAmbiguousTime(dateTime))
{
if (IsSummerPeriod)
{
return(new DateTime(dateTime.AddTicks(-baseUtcOffset.Ticks).AddTicks(-TimeZone.GetAdjustmentRules()[0].DaylightDelta.Ticks).Ticks, DateTimeKind.Utc));
}
return(new DateTime(dateTime.AddTicks(-baseUtcOffset.Ticks).Ticks, DateTimeKind.Utc));
}
IsSummerPeriod = TimeZone.IsDaylightSavingTime(dateTime);
}
return(dateTime.ToUniversalTime());
}